Anisotropy energy of spin glasses at T < Tg studied by transverse susceptibility

We have investigated the anisotropic properties of CuMn, AgMn, CuMnAu x, AuFe spin glasses at T < Tg by performing transverse susceptibility (χ⊥) measurements in zero and small (≾ 1 kG) static field H0 //z. We demonstrate that, in presence of a remanent magnetization σ initially developed along z, the response of the spin system to a small transverse (⊥ z) field involves a collective rotation of the spins which is fully characterized by a macroscopic anisotropy field HA for small deviations. At a given temperature the anisotropy energy K = σHA is found independent of σ. A slight decrease of K with temperature is evidenced in the investigated range T ≾ T g/3. At T <

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