A short note on spin pumping theory with Landau-Lifshitz-Gilbert equation under quantum fluctuation; necessity for quantization of localized spin

Abstract

We would like to point out the blind spots of the approach combining the spin pumping theory proposed by Tserkovnyak et al. with the Landau-Lifshitz-Gilbert equation; this method has been widely used for interpreting vast experimental results. The essence of the spin pumping effect is the quantum fluctuation. Thus, localized spin degrees of freedom should be quantized, i.e. be treated as magnons not as classical variables. Consequently, the precessing ferromagnet can be regarded as a magnon battery. This point of view will be useful for further progress of spintronics.

10pages, 1 figure. This article is closely related to the work by K. N.; arXiv:1201.1947

References in corpus (5)

• Spin Transfer Torques
• Theory of magnon-driven spin Seebeck effect
• Microscopic approach to current-driven domain wall dynamics
• Microscopic Calculation of Spin Torques in Disordered Ferromagnets
• First-principles study of the spin-mixing conductance in Pt/Ni${}_{81}$Fe${}_{19}$ junctions

Cited by in corpus (1)

• Quantum spin pumping mediated by magnon