Macroscopic magnetic anisotropy in spin glasses : transverse susceptibility and zero field NMR enhancement

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Abstract
Low field NMR and transverse susceptibility data in CuMn spin glass confirm that all the remanence σ is involved in the magnetization rotation. The quasi equilibrium magnetostatics of σ is characterized by uniaxial (Hax) and unidirectional (Hd) anisotropy fields determined by either experiment. The width ΔH of the hysteresis cycle, when detected, is correlated with Hax, although the reversals of σ are not fully understood. The anisotropy energy is found two orders of magnitude larger in AuFe than in CuMn

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