# Anisotropic magnetic properties and giant rotating magnetocaloric effect in double-perovskite Tb2CoMnO6

## TL;DR

This study reveals the highly anisotropic magnetic and magnetocaloric properties of Tb2CoMnO6, demonstrating a giant rotational magnetocaloric effect driven by magnetic anisotropy and complex magnetic ordering.

## Contribution

It provides the first detailed analysis of anisotropic magnetocaloric effects in double perovskite Tb2CoMnO6, highlighting its potential for magnetic cooling applications.

## Key findings

- Giant rotational magnetocaloric effect of 20.8 J/kg K.
- Distinct magnetic anisotropy with ferromagnetic order along c-axis.
- Temperature-dependent metamagnetism affecting entropy change.

## Abstract

We investigated the anisotropy of the magnetic and magnetocaloric properties of singlecrystalline double perovskite Tb2CoMnO6, which crystallizes in a monoclinic P21/n structure. Due to dissimilar magnetic anisotropy, the ferromagnetic order of the Co2+ and Mn4+ moments emerges along the c-axis at TC = 100 K, and the larger Tb3+ moments align perpendicular to the c-axis, below TTb = 15 K. The intricate temperature development of the metamagnetism along the c-axis results in a large negative change in the magnetic entropy at low temperature. On the other hand, the larger but almost reversible magnetization, perpendicular to the c-axis, results in a small and positive entropy change. This highly anisotropic magnetocaloric effect (MCE) leads to a giant rotational MCE, estimated to be 20.8 J/kg K. Our findings, based on the magnetic anisotropy in Tb2CoMnO6, enrich fundamental and applied research on magnetic materials, considering the distinct magnetic characteristics of double perovskites.

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Source: https://tomesphere.com/paper/1812.05798