JPS Conf. Proc. 2, 010209 (2014) [5 pages]
Proceedings of the International Symposium on Science Explored by Ultra Slow Muon (USM2013)
Local Magnetic Field and Positive Muon Diffusion in Yttrium Iron Garnet
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1Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
2Materials and Life Science Division, J-PARC Center, Tokai, Ibaraki 319-1195, Japan
3Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
Received September 10, 2013
We report positive muon spin rotation/relaxation (µ+SR) measurements on undoped yttrium iron garnet below 300 K in a ferrimagnetically ordered state. In zero field µ+SR measurements, static local magnetic fields were detected at 10 K in the range 0.7–1.2 T, which is consistent with the magnitude of the ordered magnetic moment. A gradual increase in a longitudinal muon spin relaxation rate was observed above 200 K with increasing temperature and attributed to thermally activated hopping of muons among magnetically inequivalent sites. The activation energy was estimated to be 0.170(7) eV.
©2014 The Physical Society of Japan
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