Correlation between Compensation Temperatures of Magnetization and Angular Momentum in GdFeCo Ferrimagnets

TL;DR

This paper establishes a linear relationship between magnetization and angular momentum compensation temperatures in GdFeCo ferrimagnets, enabling easier estimation of the latter through measurable properties, advancing ferrimagnetic spintronics.

Contribution

It introduces a method to estimate the angular momentum compensation temperature from magnetization and Curie temperatures in ferrimagnets, supported by theoretical and experimental validation.

Findings

Linear relation between compensation temperatures proven theoretically and experimentally.

The relation is governed by Curie temperature and Landé g factors.

Estimation of angular momentum compensation temperature from measurable properties.

Abstract

Determining the angular momentum compensation temperature of ferrimagnets is an important step towards ferrimagnetic spintronics, but is not generally easy to achieve it experimentally. We propose a way to estimate the angular momentum compensation temperature of ferrimagnets. We find a linear relation between the compensation temperatures of the magnetization and angular momentum in GdFeCo ferrimagnetic materials, which is proved by theoretically as well as experimentally. The linearity comes from the power-law criticality and is governed by the Curie temperature and the Land\'e g factors of the elements composing the ferrimagnets. Therefore, measuring the magnetization compensation temperature and the Curie temperature, which are easily assessable experimentally, enables to estimate the angular momentum compensation temperature of ferrimagnets. Our study provides efficient avenues into an exciting world of ferrimagnetic spintronics.