تقرير
Spin treacle in a frustrated magnet observed with spin current
| العنوان: | Spin treacle in a frustrated magnet observed with spin current |
|---|---|
| المؤلفون: | Taniguchi, Hiroki, Watanabe, Mori, Ibe, Takashi, Tokuda, Masashi, Arakawa, Tomonori, Taniguchi, Toshifumi, Gu, Bo, Ziman, Timothy, Maekawa, Sadamichi, Kobayashi, Kensuke, Niimi, Yasuhiro |
| المصدر: | Phys. Rev. B 102, 094405 (2020) |
| سنة النشر: | 2020 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science |
| الوصف: | By means of spin current, the flow of spin angular momentum, we find a regime of "spin treacle" in a frustrated magnetic system. To establish its existence, we have performed spin transport measurements in nanometer-scale spin glasses. At temperatures high enough that the magnetic moments fluctuate at high frequencies, the spin Hall angle, the conversion yield between spin current and charge current, is independent of temperature. The spin Hall angle starts to decrease at a certain temperature $T^{*}$ and completely vanishes at a lower temperature. We argue that the latter corresponds to the spin freezing temperature $T_{\rm f}$ of the nanometer-scale spin glass, where the direction of conduction electron spin is randomized by the exchange coupling with the localized moments. The present experiment \textit{quantitatively} verifies the existence of a distinct "spin treacle" between $T_{\rm f}$ and $T^{*}$. We have also quantified a time scale of fluctuation of local magnetic moments in the spin treacle from the spin relaxation time of conduction electrons. Comment: 8 pages, 9 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.102.094405 |
| URL الوصول: | http://arxiv.org/abs/2008.09250 |
| رقم الأكسشن: | edsarx.2008.09250 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.102.094405 |
|---|