Transverse spin freezing in ruthenium-dopeda−Fe90Zr10

Abstract

Muon spin relaxation $\left(\mu \mathrm{SR}\right)$ has been used to study the ferromagnet to spin glass crossover in $a-{\mathrm{Fe}}_{90-x}{\mathrm{Ru}}_x{\mathrm{Zr}}_{10}.$ We find clear evidence of two magnetic transitions in both the dynamic and static behavior of the muon polarization decay: a ferromagnetic phase transition at $T_c,$ followed by transverse spin freezing at $T_{\mathrm{xy}}.$ Comparison with earlier Mössbauer data shows that the break in $B_{\mathrm{hf}}\mathrm{}\left(T\right)\mathrm{}$ is indeed due to transverse spin freezing, and that both Mössbauer spectroscopy and $\mu \mathrm{SR}$ yield the same values for $T_{\mathrm{xy}}.$