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Title: High spin polarization in epitaxial Fe4N thin films using Cr and Ag as buffer layers

Abstract

Fe4N thin films with (001) texture were prepared by reactive sputtering on MgO substrates, utilizing either a Cr or Ag buffer layer to facilitate the epitaxial growth. X-ray diffraction, atomic force microscopy, and vibrating sample magnetometry measurements show that the Fe4N thin film grown on the Ag buffer layer is superior to that grown on the Cr buffer layer. The point contact Andreev reflection measurement was then conducted, and the spin polarizations were determined to be 61.1% and 81.3% for Fe4N thin films with Cr and Ag buffer layers, respectively. The 81.3% spin polarization is significantly higher than the ratio reported previously for Fe4N and is comparable with that of state-of-the-art Heusler alloys. This result is in agreement with the theoretical prediction on the discrepancy between the two differently defined spin polarizations for Fe4N. Moreover, our study indicates that an optimized growth process for Fe4N thin films is crucial for achieving a high spin polarization and that true half-metallicity could potentially be realized with Fe4N. Furthermore the high spin polarization of Fe4N combined with its low fabrication temperature and simple composition makes Fe4N a competitive candidate to be a half-metallic ferromagnet in spintronic devices.

Authors:
 [1];  [1];  [2];  [2];  [1];  [3]; ORCiD logo [2];  [1]
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  1. Univ. of Minnesota, Minneapolis, MN (United States)
  2. Arizona State Univ., Tempe, AZ (United States)
  3. Western Digital Corp., San Jose, CA (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES); Univ. of California, Riverside, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1503634
Alternate Identifier(s):
OSTI ID: 1433574
Grant/Contract Number:  
SC0012670
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 112; Journal Issue: 16; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Li, Hongshi, Li, Xuan, Kim, Dongrin, Zhao, Gejian, Zhang, Delin, Diao, Zhitao, Chen, Tingyong, and Wang, Jian -Ping. High spin polarization in epitaxial Fe4N thin films using Cr and Ag as buffer layers. United States: N. p., 2018. Web. doi:10.1063/1.5023698.
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Li, Hongshi, Li, Xuan, Kim, Dongrin, Zhao, Gejian, Zhang, Delin, Diao, Zhitao, Chen, Tingyong, & Wang, Jian -Ping. High spin polarization in epitaxial Fe4N thin films using Cr and Ag as buffer layers. United States. https://doi.org/10.1063/1.5023698
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Li, Hongshi, Li, Xuan, Kim, Dongrin, Zhao, Gejian, Zhang, Delin, Diao, Zhitao, Chen, Tingyong, and Wang, Jian -Ping. Wed . "High spin polarization in epitaxial Fe4N thin films using Cr and Ag as buffer layers". United States. https://doi.org/10.1063/1.5023698. https://www.osti.gov/servlets/purl/1503634.
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@article{osti_1503634,
title = {High spin polarization in epitaxial Fe4N thin films using Cr and Ag as buffer layers},
author = {Li, Hongshi and Li, Xuan and Kim, Dongrin and Zhao, Gejian and Zhang, Delin and Diao, Zhitao and Chen, Tingyong and Wang, Jian -Ping},
abstractNote = {Fe4N thin films with (001) texture were prepared by reactive sputtering on MgO substrates, utilizing either a Cr or Ag buffer layer to facilitate the epitaxial growth. X-ray diffraction, atomic force microscopy, and vibrating sample magnetometry measurements show that the Fe4N thin film grown on the Ag buffer layer is superior to that grown on the Cr buffer layer. The point contact Andreev reflection measurement was then conducted, and the spin polarizations were determined to be 61.1% and 81.3% for Fe4N thin films with Cr and Ag buffer layers, respectively. The 81.3% spin polarization is significantly higher than the ratio reported previously for Fe4N and is comparable with that of state-of-the-art Heusler alloys. This result is in agreement with the theoretical prediction on the discrepancy between the two differently defined spin polarizations for Fe4N. Moreover, our study indicates that an optimized growth process for Fe4N thin films is crucial for achieving a high spin polarization and that true half-metallicity could potentially be realized with Fe4N. Furthermore the high spin polarization of Fe4N combined with its low fabrication temperature and simple composition makes Fe4N a competitive candidate to be a half-metallic ferromagnet in spintronic devices.},
doi = {10.1063/1.5023698},
journal = {Applied Physics Letters},
number = 16,
volume = 112,
place = {United States},
year = {Wed Apr 18 00:00:00 EDT 2018},
month = {Wed Apr 18 00:00:00 EDT 2018}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1063/1.5023698
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Cited by: 16 works
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Figures / Tables:

FIG. 1 FIG. 1: (a) θ-2θ XRD scans of the Fe4N films grown on Cr and Ag buffer layers. (b) Rocking curve measurement of Fe4N (002) peaks.
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Works referenced in this record:

Negative spin polarization at the Fermi level in Fe 4 N epitaxial films by spin-resolved photoelectron spectroscopy
journal, July 2012

  • Ito, Keita; Okamoto, Kazuaki; Harada, Kazunori
  • Journal of Applied Physics, Vol. 112, Issue 1
  • DOI: 10.1063/1.4733327

Damping constant measurement and inverse giant magnetoresistance in spintronic devices with Fe 4 N
journal, December 2017

  • Li, Xuan; Li, Hongshi; Jamali, Mahdi
  • AIP Advances, Vol. 7, Issue 12
  • DOI: 10.1063/1.4994972

The calculated electronic and magnetic structures of Fe4N and Mn 4N
journal, January 1988

New Class of Materials: Half-Metallic Ferromagnets
journal, June 1983

Epitaxial growth and thermal stability of Fe 4 N film on TiN buffered Si(001) substrate
journal, April 2011

  • Xiang, H.; Shi, F. -Y.; Rzchowski, M. S.
  • Journal of Applied Physics, Vol. 109, Issue 7
  • DOI: 10.1063/1.3556919

Anisotropic magnetoresistance in facing-target reactively sputtered epitaxial γ′-Fe4N films
journal, May 2015

Anomalous Hall effects in pseudo-single-crystal γ ′-Fe 4 N thin films
journal, May 2016

  • Kabara, Kazuki; Tsunoda, Masakiyo; Kokado, Satoshi
  • AIP Advances, Vol. 6, Issue 5
  • DOI: 10.1063/1.4942550

Large magnetoresistance in current-perpendicular-to-plane pseudo spin-valves using Co 2 Fe(Ga 0.5 Ge 0.5 ) Heusler alloy and AgZn spacer
journal, September 2015

  • Du, Ye; Furubayashi, T.; Sasaki, T. T.
  • Applied Physics Letters, Vol. 107, Issue 11
  • DOI: 10.1063/1.4930229

Spin polarization and Gilbert damping of Co2Fe(GaxGe1−x) Heusler alloys
journal, October 2012

Negative anisotropic magnetoresistance resulting from minority spin transport in Ni x Fe 4− x N ( x  = 1 and 3) epitaxial films
journal, January 2017

  • Takata, Fumiya; Kabara, Kazuki; Ito, Keita
  • Journal of Applied Physics, Vol. 121, Issue 2
  • DOI: 10.1063/1.4974002

Huge Spin-Polarization of L2 1 -Ordered Co 2 MnSi Epitaxial Heusler Alloy Film
journal, August 2005

  • Sakuraba, Yuya; Nakata, Jun; Oogane, Mikihiko
  • Japanese Journal of Applied Physics, Vol. 44, Issue No. 35
  • DOI: 10.1143/JJAP.44.L1100

Factors affecting surface roughness and coercivity of Ni[sub 80]Fe[sub 20] thin films
journal, January 2002

  • Ng, V.; Hu, J. F.; Adeyeye, A. O.
  • Journal of Applied Physics, Vol. 91, Issue 10
  • DOI: 10.1063/1.1450841

Theoretical analysis of highly spin-polarized transport in the iron nitride Fe 4 N
journal, May 2006

Investigation of γ′-Fe4N thin films deposited on Si(1 0 0) and GaAs(1 0 0) substrates by facing target magnetron sputtering
journal, September 2015

Deposition and spin polarization study of Fe 4 N thin films with (111) orientation
journal, September 2017

  • Li, Xuan; Osofsky, M. S.; Jensen, Kevin L.
  • AIP Advances, Vol. 7, Issue 9
  • DOI: 10.1063/1.4991963

Spin polarization of amorphous CoFeB determined by point-contact Andreev reflection
journal, June 2008

  • Huang, S. X.; Chen, T. Y.; Chien, C. L.
  • Applied Physics Letters, Vol. 92, Issue 24
  • DOI: 10.1063/1.2949740

Perpendicular Magnetic Anisotropy and High Spin Polarization in Tetragonal Fe 4 N / BiFeO 3 Heterostructures
journal, December 2016

Relations of electronic energies and magnetic moments of tetra-3d metal (Mn, Fe, Co and Ni) nitrides calculated using a plane-wave basis method
journal, September 2010

  • Imai, Yoji; Takahashi, Yasuhiko; Kumagai, Toshiya
  • Journal of Magnetism and Magnetic Materials, Vol. 322, Issue 18
  • DOI: 10.1016/j.jmmm.2010.04.004

Co2MnSi Heusler alloy as magnetic electrodes in magnetic tunnel junctions
journal, July 2004

  • Kämmerer, S.; Thomas, A.; Hütten, A.
  • Applied Physics Letters, Vol. 85, Issue 1
  • DOI: 10.1063/1.1769082

Large tunnel magnetoresistance in magnetic tunnel junctions using a Co2MnSi Heusler alloy electrode and a MgO barrier
journal, September 2008

  • Tsunegi, Sumito; Sakuraba, Yuya; Oogane, Mikihiko
  • Applied Physics Letters, Vol. 93, Issue 11
  • DOI: 10.1063/1.2987516

Structure and magnetic properties of γ′-Fe4N films grown on MgO-buffered Si (001)
journal, December 2012

Ab initio study of structural and magnetic properties of cubic Fe4N(001) surface
journal, August 2012

Electric-field tunable perpendicular magnetic anisotropy in tetragonal Fe 4 N/BiFeO 3 heterostructures
journal, July 2017

  • Yin, Li; Wang, Xiaocha; Mi, Wenbo
  • Applied Physics Letters, Vol. 111, Issue 3
  • DOI: 10.1063/1.4993907

Perpendicular magnetic anisotropy and high spin-polarization ratio in epitaxial Fe-N thin films
journal, December 2011

Self-consistent calculations for the electronic structures of iron nitrides, Fe3N, Fe4N and Fe16N2
journal, December 1991

Correlations between structural, electronic transport, and magnetic properties of Co 2 FeAl 0.5 Si 0.5 Heusler alloy epitaxial thin films
journal, August 2015

Structural and magnetic properties of epitaxially grown full-Heusler alloy Co2MnGe thin films deposited using magnetron sputtering
journal, April 2006

  • Ishikawa, Takayuki; Marukame, Takao; Matsuda, Ken-ichi
  • Journal of Applied Physics, Vol. 99, Issue 8
  • DOI: 10.1063/1.2170980

Thin film phase diagram of iron nitrides grown by molecular beam epitaxy
journal, January 2017

Measurement of spin polarization of single crystals of La 0.7 Sr 0.3 MnO 3 and La 0.6 Sr 0.4 MnO 3
journal, July 2002

Structural and magnetic properties of size-controlled Mn0.5Zn0.5Fe2O4 nanoparticles and magnetic fluids
journal, October 2009

The preparation and ferromagnetism of single crystal ε-Fe3N(111) film on SrTiO3(100) substrate
journal, November 2016

Pronounced effects of additional resistance in Andreev reflection spectroscopy
journal, June 2010

Investigation on the structure and magnetic properties at low temperature for nanocrystalline γ′-Fe4N thin films
journal, January 2009

Measuring the Spin Polarization of a Metal with a Superconducting Point Contact
journal, October 1998

Fabrication of highly spin-polarized Co 2 FeAl 0.5 Si 0.5 thin-films
journal, April 2014

  • Vahidi, M.; Gifford, J. A.; Zhang, S. K.
  • APL Materials, Vol. 2, Issue 4
  • DOI: 10.1063/1.4869798

Probing Ferromagnets with Andreev Reflection
journal, October 1998

  • Upadhyay, Shashi K.; Palanisami, Akilan; Louie, Richard N.
  • Physical Review Letters, Vol. 81, Issue 15
  • DOI: 10.1103/PhysRevLett.81.3247

Determination of the Spin Polarization of Half-Metallic CrO 2 by Point Contact Andreev Reflection
journal, June 2001

Tunneling between ferromagnetic films
journal, September 1975

75% inverse magnetoresistance at room temperature in Fe4N/MgO/CoFeB magnetic tunnel junctions fabricated on Cu underlayer
journal, April 2009

  • Komasaki, Yosuke; Tsunoda, Masakiyo; Isogami, Shinji
  • Journal of Applied Physics, Vol. 105, Issue 7
  • DOI: 10.1063/1.3072827

Electronic, magnetic properties and phase diagrams of system with Fe4N compound: An ab initio calculations and Monte Carlo study
journal, May 2018

Near-complete spin polarization in atomically-smooth chromium-dioxide epitaxial films prepared using a CVD liquid precursor
journal, October 2001

Ab initio studies of magnetic properties of cobalt and tetracobalt nitride Co 4 N
journal, June 2007

Spin polarization of Fe4N thin films determined by point-contact Andreev reflection
journal, May 2009

  • Narahara, A.; Ito, K.; Suemasu, T.
  • Applied Physics Letters, Vol. 94, Issue 20
  • DOI: 10.1063/1.3140459

Mechanism of large magnetoresistance in Co 2 MnSi / Ag / Co 2 MnSi devices with current perpendicular to the plane
journal, September 2010

Negative Anisotropic Magnetoresistance in Fe 4 N Film
journal, July 2009

  • Tsunoda, Masakiyo; Komasaki, Yosuke; Kokado, Satoshi
  • Applied Physics Express, Vol. 2
  • DOI: 10.1143/APEX.2.083001

Diamond-like carbon films prepared by facing-target sputtering
journal, December 2002

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    Works referencing / citing this record:

    Strain relaxation in epitaxial γ ′-Fe 4 N ultrathin films
    journal, September 2019

    • Suzuki, Ippei; Uzuhashi, Jun; Ohkubo, Tadakatsu
    • Materials Research Express, Vol. 6, Issue 10
    • DOI: 10.1088/2053-1591/ab41b9

    Effect of interfacial interdiffusion on magnetism in epitaxial Fe 4 N films on LaAlO 3 substrates
    journal, November 2019

    In-situ growth of iron mononitride thin films studied using x-ray absorption spectroscopy and nuclear resonant scattering
    text, January 2019

    • Gupta, Mukul; Pandey, Nidhi; Reddy, V. R.
    • Deutsches Elektronen-Synchrotron, DESY, Hamburg
    • DOI: 10.3204/pubdb-2019-03223
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