Using high-resolution spin-resolved photoemission spectroscopy, we observed a thermal spin depolarization to which all spin-polarized electrons contribute. Furthermore we observed a distinct minority spin state near the Fermi level and a corresponding depolarization that seldom contributes to demagnetization. The origin of this depolarization has been identified as the many-body effect characteristics of half-metallic ferromagnets. Our investigation opens an experimental field of itinerant ferromagnetic physics focusing on phenomena with sub-meV energy scale.
@article{arxiv.1812.07792,
title = {Origins of thermal spin depolarization in half-metallic ferromagnet CrO$_2$},
author = {H. Fujiwara and K. Terashima and M. Sunagawa and Y. Yano and T. Nagayama and T. Fukura and F. Yoshii and Y. Matsuura and M. Ogata and T. Wakita and K. Yaji and A. Harasawa and K. Kuroda and S. Shin and K. Horiba and H. Kumigashira and Y. Muraoka and T. Yokoya},
journal= {arXiv preprint arXiv:1812.07792},
year = {2018}
}