Abstract
A macroscopic anisotropy can be defined in spin glasses (SG) from transverse susceptibility, NMR and ESR experiments, as in the presence of remanence σ the spin system responds as a rigid body to small applied fields. The absence of variation of the anisotropy energy Ea(θ) with σ, and the detection of an ESR signal for σ = 0 allow us to understand that Ea(θ) is intrinsic to the SG state and only depends on the rotation angle θ of the spin system whatever the rotation axis. This is confirmed by torque experiments in RKKY SG for which the Dzyaloshinsky-Moriya interaction between spins yields a purely unidirectional macroscopic anisotropy as demonstrated by transverse susceptibility measurements.
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