Spin Hall torques generated by rare-earth thin films
Spin Hall torques generated by rare-earth thin films
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DOI：
10.1103/physrevb.95.064412
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发表时间：
2016-12
影响因子：
3.7
通讯作者：
N. Reynolds;Priyamvada Jadaun;Priyamvada Jadaun;J. Heron;C. Jermain;Jonathan Gibbons;R. Collette;R. Buhrman;D. Schlom;D. Ralph
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文献类型：
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作者：
N. Reynolds;Priyamvada Jadaun;Priyamvada Jadaun;J. Heron;C. Jermain;Jonathan Gibbons;R. Collette;R. Buhrman;D. Schlom;D. Ralph
We report an initial experimental survey of spin-Hall torques generated by the rare-earth metals Gd, Dy, Ho, and Lu, along with comparisons to first-principles calculations of their spin Hall conductivities. Using spin torque ferromagnetic resonance (ST-FMR) measurements and DC-biased ST-FMR, we estimate lower bounds for the spin-Hall torque ratio, $\xi_{SH}$, of $\approx$ 0.04 for Gd, $\approx$ 0.05 for Dy, $\approx$ 0.14 for Ho, and $\approx$ 0.014 for Lu. The variations among these elements are qualitatively consistent with results from first principles (density functional theory, DFT, in the local density approximation with a Hubbard-U correction). The DFT calculations indicate that the spin Hall conductivity is enhanced by the presence of the partially-filled $f$ orbitals in Dy and Ho, which suggests a strategy to further strengthen the contribution of the $f$ orbitals to the spin Hall effect by shifting the electron chemical potential.
