TY - JOUR
T1 - Tunable magnetization relaxation of Fe2Cr1-xCoxSi half-metallic Heusler alloys by band structure engineering
AU - He, Shikun
AU - Liu, Yifan
AU - Zheng, Yuhong
AU - Qin, Qing
AU - Wen, Zhenchao
AU - Wu, Qingyun
AU - Yang, Yi
AU - Wang, Yupu
AU - Feng, Yuanping
AU - Teo, Kie Leong
AU - Panagopoulos, Christos
N1 - Funding Information:
The work was supported by the Ministry of Education (MOE), Academic Research Fund (AcRF) Tier 2 Grant (MOE2014-T2-1-050), the A STAR Pharos Fund (1527400026), and the National Research Foundation (NRF-CRP12-2013-01), NRF-Investigatorship (NRF-NRFI2015-04). The authors acknowledge the Singapore Synchrotron Light Source (SSLS) for providing the facilities to perform x-ray experiments.
Funding Information:
The work was supported by the Ministry of Education (MOE), Academic Research Fund (AcRF) Tier 2 Grant (MOE2014-T2-1-050), the A*STAR Pharos Fund (1527400026), and the National Research Foundation (NRF-CRP12-2013-01), NRF-Investigatorship (NRF-NRFI2015-04). The authors acknowledge the Singapore Synchrotron Light Source (SSLS) for providing the facilities to perform x-ray experiments.
Publisher Copyright:
© 2017 American Physical Society.
PY - 2017/11/1
Y1 - 2017/11/1
N2 - We report a systematic investigation on the magnetization relaxation properties of iron-based half-metallic Heusler alloy Fe2Cr1-xCoxSi (FCCS) thin films using broadband angular-resolved ferromagnetic resonance. Band structure engineering through Co doping (x) demonstrated by first-principles calculations is shown to tune the intrinsic magnetic damping over an order of magnitude, namely 1×10-2-8×10-4. Notably, the intrinsic damping constants for samples with high Co concentration are among the lowest reported for Heusler alloys and even comparable to magnetic insulator yttrium iron garnet. Furthermore, a significant reduction of both isotropic and anisotropic contributions of extrinsic damping of the FCCS alloys was found in the FCCS films with x=0.5-0.75, which is of particular importance for applications. These results demonstrate a practical recipe to tailor functional magnetization for Heusler alloy-based spintronics at room temperature.
AB - We report a systematic investigation on the magnetization relaxation properties of iron-based half-metallic Heusler alloy Fe2Cr1-xCoxSi (FCCS) thin films using broadband angular-resolved ferromagnetic resonance. Band structure engineering through Co doping (x) demonstrated by first-principles calculations is shown to tune the intrinsic magnetic damping over an order of magnitude, namely 1×10-2-8×10-4. Notably, the intrinsic damping constants for samples with high Co concentration are among the lowest reported for Heusler alloys and even comparable to magnetic insulator yttrium iron garnet. Furthermore, a significant reduction of both isotropic and anisotropic contributions of extrinsic damping of the FCCS alloys was found in the FCCS films with x=0.5-0.75, which is of particular importance for applications. These results demonstrate a practical recipe to tailor functional magnetization for Heusler alloy-based spintronics at room temperature.
UR - http://www.scopus.com/inward/record.url?scp=85040925765&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85040925765&partnerID=8YFLogxK
U2 - 10.1103/PhysRevMaterials.1.064401
DO - 10.1103/PhysRevMaterials.1.064401
M3 - Article
AN - SCOPUS:85040925765
VL - 1
JO - Physical Review Materials
JF - Physical Review Materials
SN - 2475-9953
IS - 6
M1 - 064401
ER -