Ferromagnetic resonance of perpendicularly magnetized Tm3Fe5O12/Pt heterostructures

Crossley, S.; Quindeau, A.; Swartz, A. G.; Rosenberg, E. R.; Beran, L.; Avci, C. O.; Hikita, Y.; Ross, C. A.; Hwang, H. Y.

doi:10.1063/1.5124120

Title: Ferromagnetic resonance of perpendicularly magnetized Tm₃Fe₅O₁₂/Pt heterostructures

Journal Article · Tue Oct 22 00:00:00 EDT 2019 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.5124120· OSTI ID:1604928

^[1]; Quindeau, A. ^[2]; Swartz, A. G. ^[1]; Rosenberg, E. R. ^[3]; Beran, L. ^[4];

^[3]; Hikita, Y. ^[1];

^[3]; Hwang, H. Y. ^[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)
Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials; Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Charles Univ., Prague (Czech Republic)

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 G^eff_↑↓ = 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.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: 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

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1604928

Alternate ID(s):: OSTI ID: 1571351

Journal Information:: Applied Physics Letters, Vol. 115, Issue 17; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 22 works

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Title: Ferromagnetic resonance of perpendicularly magnetized Tm₃Fe₅O₁₂/Pt heterostructures