We studied the spin-Hall effect and perpendicular magnetic anisotropy in W/Hf multilayer/CoFeB/MgO and W80Ta20/Hf multilayer/CoFeB/MgO systems and compared them with those in the β-W/CoFeB/MgO system. From the cross-sectional high-resolution transmission electron microscopy images, (i) the amorphous structure of W/Hf and W80Ta20/Hf multilayers, (ii) the flat interface between heavy metals and CoFeB, and (iii) highly (100) texture of MgO (1.0 nm) on CoFeB were observed in those multilayer systems. A higher spin-Hall effect and enhancement of perpendicular magnetic anisotropy in the W/Hf multilayer/CoFeB/MgO system can be achieved compared to the β-W/CoFeB/MgO system. In addition, we found that the resistivity in amorphous W/Hf multilayers is low compared to that in β-W. These results suggest that the artificially synthesized multilayer system is one of the avenues for realizing the heavy metal with a large spin-Hall effect and low resistivity.
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30 March 2020
Research Article|
March 30 2020
Large spin Hall effect and increase in perpendicular magnetic anisotropy in artificially synthesized amorphous W/Hf multilayer/CoFeB system
Yoshiaki Saito
;
Yoshiaki Saito
a)
1
Center for Innovative Integrated Electronic Systems, Tohoku University
, Sendai 980-0845, Japan
a)Author to whom correspondence should be addressed: ysaito@cies.tohoku.ac.jp
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Nobuki Tezuka;
Nobuki Tezuka
2
Department of Materials Science, Graduate School of Engineering, Tohoku University
, Sendai 980-8579, Japan
3
Center for Spintronics Research Network, Tohoku University
, Sendai 980-8577, Japan
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Shoji Ikeda;
Shoji Ikeda
1
Center for Innovative Integrated Electronic Systems, Tohoku University
, Sendai 980-0845, Japan
3
Center for Spintronics Research Network, Tohoku University
, Sendai 980-8577, Japan
4
Center for Science and Innovation in Spintronics, Tohoku University
, Sendai 980-8577, Japan
5
Research Institute of Electrical Communication, Tohoku University
, Sendai 980-8577, Japan
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Tetsuo Endoh
Tetsuo Endoh
1
Center for Innovative Integrated Electronic Systems, Tohoku University
, Sendai 980-0845, Japan
3
Center for Spintronics Research Network, Tohoku University
, Sendai 980-8577, Japan
4
Center for Science and Innovation in Spintronics, Tohoku University
, Sendai 980-8577, Japan
5
Research Institute of Electrical Communication, Tohoku University
, Sendai 980-8577, Japan
6
Department of Electrical Engineering, Graduate School of Engineering, Tohoku University
, Sendai 980-8579, Japan
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a)Author to whom correspondence should be addressed: ysaito@cies.tohoku.ac.jp
Appl. Phys. Lett. 116, 132401 (2020)
Article history
Received:
January 26 2020
Accepted:
March 12 2020
Citation
Yoshiaki Saito, Nobuki Tezuka, Shoji Ikeda, Tetsuo Endoh; Large spin Hall effect and increase in perpendicular magnetic anisotropy in artificially synthesized amorphous W/Hf multilayer/CoFeB system. Appl. Phys. Lett. 30 March 2020; 116 (13): 132401. https://doi.org/10.1063/5.0002642
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