# Evolution of antiferromagnetic domains in the all-in-all-out ordered pyrochlore Nd$_2$Zr$_2$O$_7$

## TL;DR

This study observes and controls magnetic domain structures in the antiferromagnetic Nd$_2$Zr$_2$O$_7$ pyrochlore, revealing how external magnetic fields influence domain configurations through spin canting mechanisms.

## Contribution

It provides the first detailed observation of antiferromagnetic domain evolution in Nd$_2$Zr$_2$O$_7$ and demonstrates control of these domains via magnetic field orientation.

## Key findings

- Magnetic domains in Nd$_2$Zr$_2$O$_7$ are induced by spin canting.
- Domain structure can be manipulated by magnetic field along [111].
- Hysteresis observed in susceptibility when field is along [111], but not along [100].

## Abstract

We report the observation of magnetic domains in the exotic, antiferromagnetically ordered all-in-all-out state of Nd$_2$Zr$_2$O$_7$, induced by spin canting. The all-in-all-out state can be realized by Ising-like spins on a pyrochlore lattice and is established in Nd$_2$Zr$_2$O$_7$ below 0.31 K for external magnetic fields up to 0.14 T. Two different spin arrangements can fulfill this configuration which leads to the possibility of magnetic domains. The all-in-all-out domain structure can be controlled by an external magnetic field applied parallel to the [111] direction. This is a result of different spin canting mechanism for the two all-in-all-out configurations for such a direction of the magnetic field. The change of the domain structure is observed through a hysteresis in the magnetic susceptibility. No hysteresis occurs, however, in case the external magnetic field is applied along [100].