Probing the spin-glass freezing transition in C u1-x M nx alloy by spin current
Journal
Physical Review B
Journal Volume
101
Journal Issue
10
Date Issued
2020
Author(s)
Wu P.-H., Tu Y.-C., Qu D., Liang H.-L., Lee S.-F., Huang S.-Y.
Abstract
In this study, we used the thermally driven spin current to investigate the spin frustrations and spin fluctuations in spin-glass (SG) Cu1-xMnx alloys. Tuning the Cu1-xMnx composition results in a transition of the alloys from the SG state to the antiferromagnetic state; these states have different spin-freezing temperatures (Tf). Most spins randomly freeze at temperatures lower than the Tf of the alloy. For each alloy composition, we obtained a temperature-dependent inverse spin Hall voltage with a peak at Tp. Crucially, Tp had nearly identical composition dependence as that of Tf, with Tp being nine times larger than Tf. Similar behavior was captured using the SG insulator, amorphous Y3Fe5O12. These results indicated that the maximum spin fluctuation in both conducting and insulating SGs occurred at temperatures considerably higher than the Tf of each. In addition, we demonstrated the importance of the effective number of valence electrons in tailoring the spin Hall angle in binary alloys. ? 2020 American Physical Society.
Subjects
Binary alloys; Copper alloys; Freezing; Glass; Glass transition; Manganese alloys; Spin glass; Yttrium iron garnet; Alloy compositions; Antiferromagnetic state; Composition dependence; Spin frustrations; Spin-freezing temperature; Spin-glass freezing; Temperature dependent; Valence electron; Spin fluctuations
Type
journal article