Temperature dependent striction effect in a single crystalline Nd2Fe14B revealed using a novel high temperature resistivity measurement technique

TL;DR

This study introduces a new high temperature resistivity measurement technique to investigate the temperature-dependent striction effect in Nd2Fe14B, revealing magnetic domain re-orientation impacts below the Curie temperature.

Contribution

A novel high temperature resistivity measurement method was developed and applied to Nd2Fe14B, uncovering temperature-dependent striction effects linked to magnetic domain re-orientation.

Findings

Curie temperature measured around 580 K.

Discrete resistivity jumps observed during cooling between 400-500 K.

Resistivity increases during cooling jumps, indicating striction effects.

Abstract

We studied the temperature dependence of resistivity in a single crystalline Nd2Fe14B using a newly developed high temperature probe. This novel probe uses mechanical pin connectors instead of conducting glue/paste. From warming and cooling curves, the Curie temperature was consistently measured around Tc = 580 K. In addition, anomalous discrete jumps were found only in cooling curves between 400 and 500 K, but not shown in warming curves. More interestingly, when the jumps occurred during cooling, the resistivity was increased. This phenomenon can be understood in terms of temperature dependent striction effect induced by the re-orientation of magnetic domains well below the Curie temperature.