Here, we investigate the spin Hall angle of Pt in a Ni80Fe20/Pt bilayer system by using a broadband spin pumping and inverse spin Hall effect measurement. An out-of-plane excitation geometry with an application of external magnetic field perpendicular to the charge current direction is utilized in order to suppress unwanted galvanomagnetic effects. Magnetization precession angle (θC) on ferromagnetic resonance for wide excitation frequency range (4–14 GHz) is estimated from the rectification voltage of anisotropic magnetoresistance (AMR) and a conventional method of using the microwave power in a coplanar waveguide. A marked difference in θC profiles for the different methods is observed, resulting in the large variation in estimated values of spin current density at Ni80Fe20/Pt interface. The frequency dependence of the spin current density estimated using the AMR effect is found to be similar to that of the inverse spin Hall voltage. We obtain the frequency-invariant spin Hall angle of 0.067 ± 0.002.
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9 January 2017
Research Article|
January 11 2017
Important role of magnetization precession angle measurement in inverse spin Hall effect induced by spin pumping
Surbhi Gupta;
Surbhi Gupta
a)
1Department of Computer Science and Electronics,
Kyushu Institute of Technology
, Iizuka, Fukuoka 820-8502, Japan
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Rohit Medwal;
Rohit Medwal
1Department of Computer Science and Electronics,
Kyushu Institute of Technology
, Iizuka, Fukuoka 820-8502, Japan
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Daichi Kodama;
Daichi Kodama
1Department of Computer Science and Electronics,
Kyushu Institute of Technology
, Iizuka, Fukuoka 820-8502, Japan
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Kouta Kondou;
Kouta Kondou
2
Center for Emergent Matter Science
, RIKEN, 2-1 Hirosawa, Wako 351-0198, Japan
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YoshiChika Otani
;
YoshiChika Otani
2
Center for Emergent Matter Science
, RIKEN, 2-1 Hirosawa, Wako 351-0198, Japan
3Institute for Solid State Physics,
University of Tokyo
, Kashiwa 277-8581, Japan
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Yasuhiro Fukuma
Yasuhiro Fukuma
a)
1Department of Computer Science and Electronics,
Kyushu Institute of Technology
, Iizuka, Fukuoka 820-8502, Japan
2
Center for Emergent Matter Science
, RIKEN, 2-1 Hirosawa, Wako 351-0198, Japan
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a)
Electronic addresses: [email protected] and [email protected]
Appl. Phys. Lett. 110, 022404 (2017)
Article history
Received:
September 17 2016
Accepted:
December 23 2016
Citation
Surbhi Gupta, Rohit Medwal, Daichi Kodama, Kouta Kondou, YoshiChika Otani, Yasuhiro Fukuma; Important role of magnetization precession angle measurement in inverse spin Hall effect induced by spin pumping. Appl. Phys. Lett. 9 January 2017; 110 (2): 022404. https://doi.org/10.1063/1.4973704
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