TY - JOUR
T1 - Structural and magnetic properties of epitaxial thin films of the equiatomic quaternary CoFeMnSi Heusler alloy
AU - Bainsla, Lakhan
AU - Yilgin, Resul
AU - Okabayashi, Jun
AU - Ono, Atsuo
AU - Suzuki, Kazuya
AU - Mizukami, Shigemi
N1 - Funding Information:
This work was partially supported by the ImPACT Program and a Grants-in-Aid for Scientific Research (Grants No. 16K14244 and No. 17F17063). XMCD experiments using the synchrotron radiation facility were performed under the approval of the Photon Factory Program Advisory Committee, KEK (No. 2015G090). L.B. is a JSPS International Research Fellow. S.M. thanks CSRN. L.B. and S.M. thank M. Kiguchi for his technical help.
Publisher Copyright:
© 2017 American Physical Society.
PY - 2017/9/5
Y1 - 2017/9/5
N2 - We report the structural and magnetic properties of CoFeMnSi equiatomic quaternary Heusler alloy thin films. The epitaxial growth of the single-crystalline films with full B2 and partial L21 ordering on the Cr-buffered MgO(001) substrate was achieved using the in situ postannealing at temperature (Ta) of 500-600°C. A saturation magnetization value of about 3.5μB/f.u. (where f.u. represents formula unit) was obtained at room temperature for the sample with Ta=600°C, which is very close to the value of 3.7μB/f.u. reported previously for a bulk sample. Ferromagnetic resonance unveiled that negligible extrinsic relaxation due to magnetic softness as well as small intrinsic spin relaxation, i.e., the Gilbert damping constant of 0.005, which is smaller than that of permalloy. The spin magnetic moments for Co, Fe, and Mn atoms for the sample with Ta=600°C deduced from the x-ray magnetic circular dichroism were in agreement with those previously reported in the bulk sample, the effects of Fe-Mn swapping and Mn antisite disorder were discussed.
AB - We report the structural and magnetic properties of CoFeMnSi equiatomic quaternary Heusler alloy thin films. The epitaxial growth of the single-crystalline films with full B2 and partial L21 ordering on the Cr-buffered MgO(001) substrate was achieved using the in situ postannealing at temperature (Ta) of 500-600°C. A saturation magnetization value of about 3.5μB/f.u. (where f.u. represents formula unit) was obtained at room temperature for the sample with Ta=600°C, which is very close to the value of 3.7μB/f.u. reported previously for a bulk sample. Ferromagnetic resonance unveiled that negligible extrinsic relaxation due to magnetic softness as well as small intrinsic spin relaxation, i.e., the Gilbert damping constant of 0.005, which is smaller than that of permalloy. The spin magnetic moments for Co, Fe, and Mn atoms for the sample with Ta=600°C deduced from the x-ray magnetic circular dichroism were in agreement with those previously reported in the bulk sample, the effects of Fe-Mn swapping and Mn antisite disorder were discussed.
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U2 - 10.1103/PhysRevB.96.094404
DO - 10.1103/PhysRevB.96.094404
M3 - Article
AN - SCOPUS:85029925556
SN - 2469-9950
VL - 96
JO - Physical Review B
JF - Physical Review B
IS - 9
M1 - 094404
ER -