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Title: Ferromagnetic resonance of perpendicularly magnetized Tm3Fe5O12/Pt heterostructures

Abstract

Herein, broadband ferromagnetic resonance is used to investigate magnetization dynamics, damping, interfacial spin transport, and perpendicular magnetic anisotropy (PMA) of (111)-oriented epitaxial thin films of the ferrimagnetic insulator Tm3Fe5O12 (TmIG) on substrates of (111)-oriented Gd3Ga5O12. A PMA field of ~162 mT is found at 350 K, in the temperature range where spin–orbit torque switching was previously reported. A Landé g-factor of 1.56 strongly supports large intrinsic spin–orbit coupling due to the presence of the heavy rare earth Tm. Gilbert damping coefficients α are compared for three samples: a 28 nm thin TmIG film (α ~ 0.014), a TmIG (28 nm)/Pt (6 nm) bilayer (α ~ 0.022), and a TmIG (28 nm)/Cu (3 nm)/Pt (6 nm) trilayer (α ~ 0.024). Applying the spin pumping formalism, we find that the real part of the effective interfacial spin mixing conductance Geff↑↓ = 5.7 × 1014 Ω–1 m–2 is comparable to that of well-studied garnet/Pt interfaces. Our work strengthens the candidacy of TmIG for spintronics applications requiring PMA in insulating thin films.

Authors:
ORCiD logo [1];  [2];  [1];  [3];  [4]; ORCiD logo [3];  [1]; ORCiD logo [3];  [1]
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  1. Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
  2. Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials; Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  4. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Charles Univ., Prague (Czech Republic)
Publication Date:
Research Org.:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Laboratory Directed Research and Development (LDRD) Program; National Institute of Standards and Technology (NIST); German Research Foundation (DFG); Max-Planck-Institute of Microstructure Physics
OSTI Identifier:
1604928
Alternate Identifier(s):
OSTI ID: 1571351
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 115; Journal Issue: 17; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Crossley, S., Quindeau, A., Swartz, A. G., Rosenberg, E. R., Beran, L., Avci, C. O., Hikita, Y., Ross, C. A., and Hwang, H. Y. Ferromagnetic resonance of perpendicularly magnetized Tm3Fe5O12/Pt heterostructures. United States: N. p., 2019. Web. doi:10.1063/1.5124120.
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Crossley, S., Quindeau, A., Swartz, A. G., Rosenberg, E. R., Beran, L., Avci, C. O., Hikita, Y., Ross, C. A., & Hwang, H. Y. Ferromagnetic resonance of perpendicularly magnetized Tm3Fe5O12/Pt heterostructures. United States. https://doi.org/10.1063/1.5124120
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Crossley, S., Quindeau, A., Swartz, A. G., Rosenberg, E. R., Beran, L., Avci, C. O., Hikita, Y., Ross, C. A., and Hwang, H. Y. Tue . "Ferromagnetic resonance of perpendicularly magnetized Tm3Fe5O12/Pt heterostructures". United States. https://doi.org/10.1063/1.5124120. https://www.osti.gov/servlets/purl/1604928.
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@article{osti_1604928,
title = {Ferromagnetic resonance of perpendicularly magnetized Tm3Fe5O12/Pt heterostructures},
author = {Crossley, S. and Quindeau, A. and Swartz, A. G. and Rosenberg, E. R. and Beran, L. and Avci, C. O. and Hikita, Y. and Ross, C. A. and Hwang, H. Y.},
abstractNote = {Herein, broadband ferromagnetic resonance is used to investigate magnetization dynamics, damping, interfacial spin transport, and perpendicular magnetic anisotropy (PMA) of (111)-oriented epitaxial thin films of the ferrimagnetic insulator Tm3Fe5O12 (TmIG) on substrates of (111)-oriented Gd3Ga5O12. A PMA field of ~162 mT is found at 350 K, in the temperature range where spin–orbit torque switching was previously reported. A Landé g-factor of 1.56 strongly supports large intrinsic spin–orbit coupling due to the presence of the heavy rare earth Tm. Gilbert damping coefficients α are compared for three samples: a 28 nm thin TmIG film (α ~ 0.014), a TmIG (28 nm)/Pt (6 nm) bilayer (α ~ 0.022), and a TmIG (28 nm)/Cu (3 nm)/Pt (6 nm) trilayer (α ~ 0.024). Applying the spin pumping formalism, we find that the real part of the effective interfacial spin mixing conductance Geff↑↓ = 5.7 × 1014 Ω–1 m–2 is comparable to that of well-studied garnet/Pt interfaces. Our work strengthens the candidacy of TmIG for spintronics applications requiring PMA in insulating thin films.},
doi = {10.1063/1.5124120},
journal = {Applied Physics Letters},
number = 17,
volume = 115,
place = {United States},
year = {Tue Oct 22 00:00:00 EDT 2019},
month = {Tue Oct 22 00:00:00 EDT 2019}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1063/1.5124120
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Cited by: 22 works
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Figures / Tables:

FIG. 1 FIG. 1: Magnetization hysteresis M(H) as a function of applied field H, for the 28 nm-thick T mlG film at room temperature and 350 K.
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