2013
DOI: 10.1063/1.4853195
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Precessional magnetization induced spin current from CoFeB into Ta

Abstract: The spin dynamics at the interface between the CoFeB and Ta layer has been studied using spin pumping and spin wave characterizations. The spin pumping driven by the ferromagnetic resonance in the CoFeB layer injects a spin current into Ta layer which results in an electromotive force across the Ta layer due to the inverse spin Hall effect. Upon changing the polarity of the bias magnetic field, the polarity of the output voltage inverts and the output voltage increases linearly in respect to the microwave sign… Show more

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Cited by 29 publications
(36 citation statements)
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“…The wave guide of the spin pumping devices, as shown in Fig. 2(a), was similar to those in our previous reports [20][21][22] , with the signal line width of 75 μm and ground line width of 225 μm, and separation between the lines of 37.5 μm. The illustration of the spin pumping process is shown in Fig.…”
supporting
confidence: 83%
“…The wave guide of the spin pumping devices, as shown in Fig. 2(a), was similar to those in our previous reports [20][21][22] , with the signal line width of 75 μm and ground line width of 225 μm, and separation between the lines of 37.5 μm. The illustration of the spin pumping process is shown in Fig.…”
supporting
confidence: 83%
“…As seen, the output voltage polarity is altered by changing the magnetic field polarity which is consistent with the spin pumping experiments reported by other groups 4,5 . In most of the previous spin pumping works based on metallic ferromagnets like NiFe or CoFeB, only a single resonant peak is observed 5,6,29 ; however, in this experiment, three frequencies are present in the output voltage spectra. The main frequency occurs at 6.2 GHz which is associated with FMR excitation while the higher frequencies of 6.7 and 8.3 GHz are correlated with spin waves excitation in the magnetic layer.…”
supporting
confidence: 91%
“…The spin waves have different resonant frequencies compared to the FMR mode. The spin waves modes present in our experiments are mostly magnetostatic surface spin waves modes where the bias magnetic field and the spin waves wavevector are in the plane of the magnetic film and normal to each other 5,23,24 .…”
mentioning
confidence: 86%
“…The sign of V IREE as shown in Figure (a) is reversed when the in‐plane magnetic field H is changed from ϕ H = 90° to ϕ H = −90° (with ϕ H being the angle between the external magnetic field and the direction in which the voltage is measured, the x‐direction in Supporting Information Figure S1). This result is the same as the ISHE in metal materials induced by spin pumping . The line shape of the V IREE extracted by the two‐step measurement with sample flipping is symmetric Lorentzian, which indicates the obtained electromotive force here entirely due to the IREE induced by the spin pumping .…”
supporting
confidence: 73%