Large anisotropy in the paramagnetic susceptibility of SrRuO3 films

TL;DR

This study uses the extraordinary Hall effect to measure the paramagnetic susceptibility of SrRuO3 films, revealing significant anisotropy near the Curie temperature due to large magnetocrystalline effects.

Contribution

It demonstrates the temperature-dependent anisotropy of susceptibility in SrRuO3 films using Hall effect measurements, highlighting the role of magnetocrystalline anisotropy.

Findings

Susceptibility is isotropic at 300 K

Susceptibility becomes highly anisotropic near Tc

Divergence along a single crystallographic direction

Abstract

By using the extraordinary Hall effect in SrRuO3 films we performed sensitive measurements of the paramagnetic susceptibility in this itinerant ferromagnet, from Tc (~ 150 K) to 300 K. These measurements, combined with measurements of magnetoresistance, reveal that the susceptibility, which is almost isotropic at 300 K, becomes highly anisotropic as the temperature is lowered, diverging along a single crystallographic direction in the vicinity of Tc. The results provide a striking manifestation of the effect of exceptionally large magnetocrystalline anisotropy in the paramagnetic state of a 4d itinerant ferromagnet.