Enhanced DC Spin Pumping into a Fluctuating Ferromagnet near Tc

Abstract

A linear-response formulation of the dc spin pumping, i.e., a spin injection from a precessing ferromagnet into an adjacent spin sink, is developed in view of describing many-body effects caused by spin fluctuations in the spin sink. It is shown that, when an itinerant ferromagnet near Tc is used as the spin sink, the spin pumping is largely increased owing to the fluctuation enhancement of the spin conductance across the precessing ferromagnet/spin sink interface. As an example, the enhanced spin pumping from permalloy into nickel palladium alloy (Tc ~ 20K) is analyzed by means of a self-consistent renormalization scheme, and it is predicted that the enhancement can be as large as tenfold.

11pages, 7figures

References in corpus (6)

• Spin Seebeck insulator
• Observation of the Spin-Seebeck Effect in a Ferromagnetic Semiconductor
• Scaling behavior of the spin pumping effect in ferromagnet/platinum bilayers
• Spin Seebeck effect in antiferromagnets and compensated ferrimagnets
• Dynamic Spin Injection into Chemical Vapor Deposited Graphene
• The spin Hall effect as a probe of nonlinear spin fluctuations

Cited by in corpus (5)

• Quantitative Temperature Dependence of Longitudinal Spin Seebeck Effect at High Temperatures
• Spin current noise of the spin Seebeck effect and spin pumping
• Enhancement of spin transparency by interfacial alloying
• Relaxation mechanism driven by spin angular momentum absorption throughout antiferromagnetic phase transition in NiFe surface oxides
• Theory of spin transport through antiferromagnetic insulator