Enhancement of thermal spin pumping by orbital angular momentum of rare earth iron garnet

TL;DR

This paper investigates how the orbital angular momentum of rare earth iron garnet enhances thermal spin current generation in bilayer systems, revealing the role of magnetic properties in spin pumping efficiency.

Contribution

It demonstrates that the orbital angular momentum of rare earth ions in iron garnet significantly boosts thermal spin pumping, a novel insight into magnetic property effects.

Findings

Orbital angular momentum enhances thermal spin current generation.

Lanthanide substitution increases spin pumping efficiency.

Magnetic properties of rare earth ions influence spin Seebeck effect.

Abstract

In a bilayer of ferromagnetic and non-magnetic metal, spin pumping can be generated by a thermal gradient. The spin current generation depends on the spin mixing conductance of the interface and the magnetic properties of the ferromagnetic layer. Due to its low intrinsic damping, rare earth iron garnet is often used for the ferromagnetic layer in the spin Seebeck experiment. However, it is actually a ferrimagnetic with antiferromagnetically coupled magnetic lattices and the contribution of rare earth magnetic lattice of rare earth iron garnet on thermal spin pumping is not well understand. Here we focus on the effect of magnetic properties of lanthanide and show that the orbital angular momentum of rare earth iron garnet enhances thermal spin current generation of lanthanide substituted yttrium iron garnet.