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Title: Magnetic properties of ultrathin discontinuous Co/Pt multilayers: Comparison with short-range ordered and isotropic CoPt 3 films

Abstract

In this paper, magnetic properties of thin Co/Pt multilayers have been investigated in order to study the dependence of magnetization $M$, uniaxial anisotropy $${K}_{u}$$, and Curie temperature $${T}_{\mathrm{C}}$$ on the multilayer thickness, composition, and structure. A comparison between epitaxial submonolayer multilayers and epitaxial fcc $${\mathrm{CoPt}}_{3}$$ alloy films with large perpendicular magnetic anisotropy (PMA) attributed to growth-induced Co clustering reveals significant differences in the temperature dependence of magnetization $M(T)$, despite the presence of thin planar Co platelets in both cases. Even the thinnest discontinuous multilayered structure shows a Langevin-like $M(T)$, while the alloy films with PMA show a broadened and enhanced $M(T)$ indicating a distribution of environments, including monolayer Co platelets separated by only 1-2 layers of Pt. These differences have been reproduced in Monte Carlo simulations, and are shown to be due to different distributions of Co-Co and Co-Pt nearest neighbors. Finally, the relatively uniform Co-Co coordination of even a discontinuous rough multilayer produces a Langevin-like $M(T)$, whereas the broader distribution associated with platelets in the PMA films results in a nearly linear $T$ dependence of $M$.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Physics; ETH Zurich (Switzerland). Dept. of Materials
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Physics; Univ. of Rouen (France)
  3. Univ. of Rouen (France)
  4. Univ. of California, San Diego, CA (United States). Dept. of Physics
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Santa Cruz, CA (United States). Dept. of Physics
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Physics; Univ. of California, San Diego, CA (United States). Dept. of Physics
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States); Univ. of Rouen (France)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); IT Resource Center of Haute Normandie (CRIHAN) (France)
OSTI Identifier:
1456946
Alternate Identifier(s):
OSTI ID: 1256117
Grant/Contract Number:  
AC02-05CH11231; FG02-04ER46100; AC02-05-CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 22; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ferroelectricity; magnetism; multilayer thin films; Monte Carlo methods

Citation Formats

Charilaou, M., Bordel, C., Berche, P. -E., Maranville, B. B., Fischer, P., and Hellman, F. Magnetic properties of ultrathin discontinuous Co/Pt multilayers: Comparison with short-range ordered and isotropic CoPt3 films. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.93.224408.
Charilaou, M., Bordel, C., Berche, P. -E., Maranville, B. B., Fischer, P., & Hellman, F. Magnetic properties of ultrathin discontinuous Co/Pt multilayers: Comparison with short-range ordered and isotropic CoPt3 films. United States. doi:https://doi.org/10.1103/PhysRevB.93.224408
Charilaou, M., Bordel, C., Berche, P. -E., Maranville, B. B., Fischer, P., and Hellman, F. Tue . "Magnetic properties of ultrathin discontinuous Co/Pt multilayers: Comparison with short-range ordered and isotropic CoPt3 films". United States. doi:https://doi.org/10.1103/PhysRevB.93.224408. https://www.osti.gov/servlets/purl/1456946.
@article{osti_1456946,
title = {Magnetic properties of ultrathin discontinuous Co/Pt multilayers: Comparison with short-range ordered and isotropic CoPt3 films},
author = {Charilaou, M. and Bordel, C. and Berche, P. -E. and Maranville, B. B. and Fischer, P. and Hellman, F.},
abstractNote = {In this paper, magnetic properties of thin Co/Pt multilayers have been investigated in order to study the dependence of magnetization $M$, uniaxial anisotropy ${K}_{u}$, and Curie temperature ${T}_{\mathrm{C}}$ on the multilayer thickness, composition, and structure. A comparison between epitaxial submonolayer multilayers and epitaxial fcc ${\mathrm{CoPt}}_{3}$ alloy films with large perpendicular magnetic anisotropy (PMA) attributed to growth-induced Co clustering reveals significant differences in the temperature dependence of magnetization $M(T)$, despite the presence of thin planar Co platelets in both cases. Even the thinnest discontinuous multilayered structure shows a Langevin-like $M(T)$, while the alloy films with PMA show a broadened and enhanced $M(T)$ indicating a distribution of environments, including monolayer Co platelets separated by only 1-2 layers of Pt. These differences have been reproduced in Monte Carlo simulations, and are shown to be due to different distributions of Co-Co and Co-Pt nearest neighbors. Finally, the relatively uniform Co-Co coordination of even a discontinuous rough multilayer produces a Langevin-like $M(T)$, whereas the broader distribution associated with platelets in the PMA films results in a nearly linear $T$ dependence of $M$.},
doi = {10.1103/PhysRevB.93.224408},
journal = {Physical Review B},
number = 22,
volume = 93,
place = {United States},
year = {2016},
month = {6}
}

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Cited by: 3 works
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Figures / Tables:

FIG. 1 FIG. 1: Intrinsic uniaxial magnetic anisotropy at 300 K vs. Pt layer thickness for Co/Pt multilayers with various Co layer thicknesses.

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Works referenced in this record:

Localized Kerr study of the magnetic properties of an ultrathin epitaxial Co wedge grown on Pt(111)
journal, April 1993

  • McGee, N. W. E.; Johnson, M. T.; de Vries, J. J.
  • Journal of Applied Physics, Vol. 73, Issue 7
  • DOI: 10.1063/1.352943

Current-induced magnetization reversal in nanopillars with perpendicular anisotropy
journal, February 2006

  • Mangin, S.; Ravelosona, D.; Katine, J. A.
  • Nature Materials, Vol. 5, Issue 3
  • DOI: 10.1038/nmat1595

Growth-induced magnetic anisotropy and clustering in vapor-deposited Co-Pt alloy films
journal, November 1999


Spin polarization of currents in Co/Pt multilayer and Co–Pt alloy thin films
journal, July 2010

  • Rajanikanth, A.; Kasai, S.; Ohshima, N.
  • Applied Physics Letters, Vol. 97, Issue 2
  • DOI: 10.1063/1.3460910

High-accuracy Monte Carlo study of the three-dimensional classical Heisenberg ferromagnet
journal, March 1991


Optimization of Co/Pt multilayers for applications of current-driven domain wall propagation
journal, October 2011

  • Wang, K.; Wu, M-C.; Lepadatu, S.
  • Journal of Applied Physics, Vol. 110, Issue 8
  • DOI: 10.1063/1.3654045

Long-range order and ordering kinetics in CoPt3
journal, July 1972

  • Berg, H.; Cohen, J. B.
  • Metallurgical and Materials Transactions B, Vol. 3, Issue 7
  • DOI: 10.1007/BF02642563

A new phase diagram for layered antiferromagnetic films
journal, January 2003

  • Hellwig, Olav; Kirk, Taryl L.; Kortright, Jeffrey B.
  • Nature Materials, Vol. 2, Issue 2
  • DOI: 10.1038/nmat806

Pt magnetization profile in a Pt/Co bilayer studied by resonant magnetic x-ray reflectometry
journal, December 2001


Elastic constants and magnetic anisotropy of Co∕Pt superlattice thin films
journal, March 2005

  • Nakamura, Nobutomo; Ogi, Hirotsugu; Hirao, Masahiko
  • Applied Physics Letters, Vol. 86, Issue 11
  • DOI: 10.1063/1.1886900

Direct Observation of Massless Domain Wall Dynamics in Nanostripes with Perpendicular Magnetic Anisotropy
journal, June 2012


Orbital magnetic moments of Co in multilayers with perpendicular magnetic anisotropy
journal, May 1994


Perpendicular magnetic anisotropies of (Pt/Co/Pt)/X superlattices
journal, June 1995

  • MacLaren, J. M.; Victora, R. H.
  • Applied Physics Letters, Vol. 66, Issue 24
  • DOI: 10.1063/1.113763

Perpendicular magnetic anisotropy in Pd/Co and Pt/Co thin‐film layered structures
journal, May 1988

  • Carcia, P. F.
  • Journal of Applied Physics, Vol. 63, Issue 10
  • DOI: 10.1063/1.340404

Magnetocrystalline anisotropy in (111) CoPt 3 thin films probed by x-ray magnetic circular dichroism
journal, September 1998


Antiferromagnetic interlayer coupling in Pt/Co multilayers with perpendicular anisotropy
journal, January 2009


Observation of room-temperature magnetic skyrmions and their current-driven dynamics in ultrathin metallic ferromagnets
journal, February 2016

  • Woo, Seonghoon; Litzius, Kai; Krüger, Benjamin
  • Nature Materials, Vol. 15, Issue 5
  • DOI: 10.1038/nmat4593

Depth profile of spin and orbital magnetic moments in a subnanometer Pt film on Co
journal, August 2005


Observation of internal interfaces in Pt x Co 1 x ( x 0.7 ) alloy films: A likely cause of perpendicular magnetic anisotropy
journal, August 1996


Perpendicular magnetic anisotropy in Co/Pt multilayers studied from a view point of anisotropy of magnetic Compton profiles
journal, April 2010

  • Ota, M.; Itou, M.; Sakurai, Y.
  • Applied Physics Letters, Vol. 96, Issue 15
  • DOI: 10.1063/1.3374881

Oxygen-assisted room-temperature deposition of CoPt3 films with perpendicular magnetic anisotropy
journal, November 2002

  • Maranville, B. B.; Hellman, F.
  • Applied Physics Letters, Vol. 81, Issue 21
  • DOI: 10.1063/1.1523161

Simulation of clustering and anisotropy due to Co step-edge segregation in vapor-deposited Co Pt 3
journal, March 2006


Evidence for nanoscale two-dimensional Co clusters in CoPt 3 films with perpendicular magnetic anisotropy
journal, March 2010


Spin‐dependent x‐ray absorption in Co/Pt multilayers
journal, April 1991

  • Rüegg, S.; Schütz, G.; Fischer, P.
  • Journal of Applied Physics, Vol. 69, Issue 8
  • DOI: 10.1063/1.347926

Spin-torque oscillator using a perpendicular polarizer and a planar free layer
journal, April 2007

  • Houssameddine, D.; Ebels, U.; Delaët, B.
  • Nature Materials, Vol. 6, Issue 6
  • DOI: 10.1038/nmat1905

Suppression of the perpendicular anisotropy at the CoO Néel temperature in exchange-biased CoO/[Co/Pt] multilayers
journal, September 2009

  • Shipton, E.; Chan, K.; Hauet, T.
  • Applied Physics Letters, Vol. 95, Issue 13
  • DOI: 10.1063/1.3240402

Asymmetric magnetic domain-wall motion by the Dzyaloshinskii-Moriya interaction
journal, December 2013


Periodic magnetic domain wall pinning in an ultrathin film with perpendicular anisotropy generated by the stray magnetic field of a ferromagnetic nanodot array
journal, March 2009

  • Metaxas, P. J.; Zermatten, P. -J.; Jamet, J. -P.
  • Applied Physics Letters, Vol. 94, Issue 13
  • DOI: 10.1063/1.3105988

Spin injection in silicon at zero magnetic field
journal, January 2009

  • Grenet, L.; Jamet, M.; Noé, P.
  • Applied Physics Letters, Vol. 94, Issue 3
  • DOI: 10.1063/1.3064135

Equation of State Calculations by Fast Computing Machines
journal, June 1953

  • Metropolis, Nicholas; Rosenbluth, Arianna W.; Rosenbluth, Marshall N.
  • The Journal of Chemical Physics, Vol. 21, Issue 6
  • DOI: 10.1063/1.1699114

Experimental and theoretical x-ray magnetic-circular-dichroism study of the magnetic properties of Co 50 Pt 50 thin films
journal, July 2000


Precise determination of the bond percolation thresholds and finite-size scaling corrections for the sc, fcc, and bcc lattices
journal, January 1998

  • Lorenz, Christian D.; Ziff, Robert M.
  • Physical Review E, Vol. 57, Issue 1, p. 230-236
  • DOI: 10.1103/PhysRevE.57.230

Frustration driven stripe domain formation in Co/Pt multilayer films
journal, July 2009

  • Davies, J. E.; Hellwig, O.; Fullerton, E. E.
  • Applied Physics Letters, Vol. 95, Issue 2
  • DOI: 10.1063/1.3179553

Oscillatory interlayer coupling in Co Pt multilayers with perpendicular anisotropy
journal, June 2005


Optimization of out-of-plane magnetized Co/Pt multilayers with resistive buffer layers
journal, August 2011

  • Emori, Satoru; Beach, Geoffrey S. D.
  • Journal of Applied Physics, Vol. 110, Issue 3
  • DOI: 10.1063/1.3622613

Response and enhancement of surface magneto-optic Kerr effect for Co–Pt(111) ultrathin films and surface alloy
journal, June 1999


Effect of interfacial structures on anomalous Hall behavior in perpendicular Co/Pt multilayers
journal, March 2013

  • Zhang, J. Y.; Wu, Z. L.; Wang, S. G.
  • Applied Physics Letters, Vol. 102, Issue 10
  • DOI: 10.1063/1.4795331

Growth of vapor-deposited cobalt films on Pt(111) studied by scanning tunneling microscopy
journal, January 1994


Cumulative minor loop growth in Co/Pt and Co/Pd multilayers
journal, September 2010


Magneto-optic properties of electron cyclotron resonance ion beam sputtered and magnetron sputtered Co/Pt multilayers
journal, October 2007

  • Fiedler, Steffen; Stillrich, Holger; Oepen, Hans Peter
  • Journal of Applied Physics, Vol. 102, Issue 8
  • DOI: 10.1063/1.2794713

Periodic arrays of magnetic nanostructures by depositing Co/Pt multilayers on the barrier layer of ordered anodic alumina templates
journal, July 2012

  • Piraux, L.; Antohe, V. A.; Abreu Araujo, F.
  • Applied Physics Letters, Vol. 101, Issue 1
  • DOI: 10.1063/1.4731640

Ion-beam-assisted growth of CoPt3 films
journal, October 2001

  • Vasumathi, D.; Maranville, B. B.; Hellman, F.
  • Applied Physics Letters, Vol. 79, Issue 17
  • DOI: 10.1063/1.1412430

Anomalous enhancement in interfacial perpendicular magnetic anisotropy through uphill diffusion
journal, June 2014

  • Das, Tanmay; Kulkarni, Prabhanjan D.; Purandare, S. C.
  • Scientific Reports, Vol. 4, Issue 1
  • DOI: 10.1038/srep05328

Additive interfacial chiral interaction in multilayers for stabilization of small individual skyrmions at room temperature
journal, January 2016

  • Moreau-Luchaire, C.; Moutafis, C.; Reyren, N.
  • Nature Nanotechnology, Vol. 11, Issue 5
  • DOI: 10.1038/nnano.2015.313

Enhancement of perpendicular magnetic anisotropy through reduction of Co-Pt interdiffusion in (Co/Pt) multilayers
journal, April 2012

  • Bandiera, S.; Sousa, R. C.; Rodmacq, B.
  • Applied Physics Letters, Vol. 100, Issue 14
  • DOI: 10.1063/1.3701585

Magnetic field dependence of asymmetry in the magnetization reversal of ultrathin Co films and Co/Pt multilayers with perpendicular anisotropy
journal, August 2008

  • Iunin, Y. L.; Kabanov, Y. P.; Nikitenko, V. I.
  • Journal of Magnetism and Magnetic Materials, Vol. 320, Issue 15
  • DOI: 10.1016/j.jmmm.2008.02.186

Magnetic Properties of Exchange-Biased $[{\rm Co/Pt}]_{\rm n}$ Multilayer With Perpendicular Magnetic Anisotropy
journal, June 2010


Imaging the Cone State of the Spin Reorientation Transition
journal, May 2008


Magnetic properties of Co/Pt-multilayers
journal, February 1991


Large magnetic moment enhancement and extraordinary Hall effect in Co/Pt superlattices
journal, July 2000


Asymmetric Domain Nucleation and Unusual Magnetization Reversal in Ultrathin Co Films with Perpendicular Anisotropy
journal, March 2007


Skyrmion states in multilayer exchange coupled ferromagnetic nanostructures with distinct anisotropy directions
journal, November 2015

  • Fraerman, A. A.; Ermolaeva, O. L.; Skorohodov, E. V.
  • Journal of Magnetism and Magnetic Materials, Vol. 393
  • DOI: 10.1016/j.jmmm.2015.06.017

Evidence of a Surface-Mediated Magnetically Induced Miscibility Gap in Co-Pt Alloy Thin Films
journal, August 1995


Spin-Transfer-Torque-Assisted Domain-Wall Creep in a Co / Pt Multilayer Wire
journal, April 2010


Summary Abstract: Perpendicular magnetic anisotropy in Co/Pd and Co/Pt superlattices
journal, July 1987

  • Carcia, Peter F.
  • Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, Vol. 5, Issue 4
  • DOI: 10.1116/1.574896

Seed Layer Effect on the Magnetic Properties of Ultrathin Co/Pt Multilayers With Perpendicular Magnetic Anisotropy
journal, November 2014

  • Chatterjee, Jyotirmoy; Tahmasebi, Taiebeh; Mertens, Sofie
  • IEEE Transactions on Magnetics, Vol. 50, Issue 11
  • DOI: 10.1109/TMAG.2014.2326731

Magnetic properties of MgO-[Co/Pt] multilayers with a CoFeB insertion layer
journal, May 2013

  • Ishikawa, S.; Sato, H.; Yamanouchi, M.
  • Journal of Applied Physics, Vol. 113, Issue 17
  • DOI: 10.1063/1.4798499

Surface and interface magnetic moments of Co/Cu(001)
journal, June 2001


Measuring and tailoring the Dzyaloshinskii-Moriya interaction in perpendicularly magnetized thin films
journal, July 2014


Origin of magneto-optic enhancement in CoPt alloys and Co/Pt multilayers
journal, June 2012

  • Višňovský, Štefan; Jakubisová Lišková, Eva; Nývlt, Miroslav
  • Applied Physics Letters, Vol. 100, Issue 23
  • DOI: 10.1063/1.4726121

Optical and magneto-optical properties of Co/Pt multilayers
journal, March 1996


Interfacial effects on magnetic relaxation in Co/Pt multilayers
journal, October 2003


Dilute Ferromagnetic Alloys
journal, March 1965

  • Crangle, J.; Scott, W. R.
  • Journal of Applied Physics, Vol. 36, Issue 3
  • DOI: 10.1063/1.1714264

Magnetic environment model of ferromagnetism in dilute P t Co alloys
journal, April 1987

  • Parra, R. E.; López, R. A.
  • Journal of Applied Physics, Vol. 61, Issue 8
  • DOI: 10.1063/1.338554

Structure of the cobalt-filled missing-row reconstruction of Pt(110)
journal, October 2004


Magnetic properties and chemical ordering in Co-Pt
journal, January 1989

  • Sanchez, J. M.; Moran-Lopez, J. L.; Leroux, C.
  • Journal of Physics: Condensed Matter, Vol. 1, Issue 2
  • DOI: 10.1088/0953-8984/1/2/019

Perpendicular magnetic anisotropy and magneto‐optical Kerr effect of vapor‐deposited Co/Pt‐layered structures
journal, June 1989

  • Zeper, W. B.; Greidanus, F. J. A. M.; Carcia, P. F.
  • Journal of Applied Physics, Vol. 65, Issue 12
  • DOI: 10.1063/1.343189

Angular Dependence of Domain Wall Resistivity in Artificial Magnetic Domain Structures
journal, November 2006


Critical exponents of the classical three-dimensional Heisenberg model: A single-cluster Monte Carlo study
journal, July 1993


    Works referencing / citing this record:

    Impact of operating temperature on the electrical and magnetic properties of the bottom-pinned perpendicular magnetic tunnel junctions
    journal, October 2018

    • Wu, Y. C.; Kim, W.; Rao, S.
    • Applied Physics Letters, Vol. 113, Issue 14
    • DOI: 10.1063/1.5042028

    Interface-induced phenomena in magnetism
    journal, June 2017