Spin treacle in a frustrated magnet observed with spin current

Abstract

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 $T^{\ast }$ and completely vanishes at a lower temperature. We argue that the latter corresponds to the spin freezing temperature $T_{\mathrm{f}}$ 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 $T_{\mathrm{f}}$ and $T^{\ast }$. 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.

arXiv comment8 pages, 9 figures

References in corpus (10)

• Anomalous Hall effect
• Quantum Annealing in the Transverse Ising Model
• Giant Spin Hall Effect Induced by Skew Scattering from Bismuth Impurities inside Thin Film CuBi Alloys
• Spin Hall Effect induced by resonant scattering on impurities in metals
• Reciprocal spin Hall effects in conductors with strong spin-orbit coupling: a review
• Extrinsic spin Hall effects measured with lateral spin valve structures
• The spin Hall effect as a probe of nonlinear spin fluctuations
• Chiral susceptibility in canonical spin glass and reentrant alloys from Hall effect measurements
• Strong Suppression of the Spin Hall Effect in the Spin Glass State
• Magnetic dephasing in mesoscopic spin glasses

Cited by in corpus (2)

• Floquet engineering using pulse driving in a diamond two-level system under a large-amplitude modulation
• Influence of magnetic fields on the performance of spin-orbit torque magnetic random-access memory