Spin injection and spin transport in paramagnetic insulators

Abstract

We investigate the spin injection and the spin transport in paramagnetic insulators described by simple Heisenberg interactions using auxiliary particle methods. Some of these methods allow access to both paramagnetic states above magnetic transition temperatures and magnetic states at low temperatures. It is predicted that the spin injection at an interface with a normal metal is rather insensitive to temperatures above the magnetic transition temperature. On the other hand below the transition temperature, it decreases monotonically and disappears at zero temperature. We also analyze the bulk spin conductance. It is shown that the conductance becomes zero at zero temperature as predicted by linear spin wave theory but increases with temperature and is maximized around the magnetic transition temperature. These findings suggest that the compromise between the two effects determines the optimal temperature for spintronics applications utilizing magnetic insulators.

8 pages, 5 figures

References in corpus (6)

• Dissipationless Quantum Spin Current at Room Temperature
• Spin Seebeck insulator
• Superfluid spin transport through antiferromagnetic insulators
• Spin transport in Heisenberg antiferromagnets
• Paramagnetic spin pumping
• How to measure a spinon Fermi surface

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• Probing short-range magnetic order in a geometrically frustrated magnet by spin Seebeck effect
• Mechanism of paramagnetic spin Seebeck effect
• Spin Seebeck effect in paramagnets and antiferromagnets at elevated temperatures
• Role of spin mixing conductance in determining thermal spin pumping near the ferromagnetic phase transition in EuO_{1-x} and La2NiMnO6
• Theory of spin transport through antiferromagnetic insulator
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• Theoretical analysis of FMR-driven spin pumping current and its properties via Self-Consistent Harmonic Approximation
• Electrically induced angular momentum flow between separated ferromagnets
• Spin current injection at magnetic insulator/superconductor interfaces
• Drag resistance mediated by quantum spin liquids
• Spin and thermal transport and critical phenomena in three-dimensional antiferromagnets
• Effect of iron thicknesses on spin transport in a Fe/Au bilayer system
• Ginzburg-Landau theory of spin pumping through an antiferromagnetic layer near the Néel temperature