Spin‐glass dynamics from magnetic noise, relaxation, and susceptibility measurements (invited)

摘要: We present a quantitative comparison between dynamic measurements on spin glasses. The case of CdIn0.3Cr1.7S4 is discussed in detail and references are made to CsNiFeF6 Ag:Mn (2.6%). measured quantities the relaxation thermoremanent magnetization MTRM(t) range observation times 1–105 s, out‐of‐phase susceptibility χ‘(ω) 10−3–5×104 Hz, magnetic noise power spectrum M2(ω) 10−2 103 Hz. aging analyzed basis phenomenological theory time scaling which allows derive form equilibrium relaxation. It shown that values χ‘ ∼(M2(ω)) related according fluctuation dissipation theorem (FDT). consequences applicability FDT frequency domain discussed, with reference expected violation spin‐glass phase at ω=0. An important modification dependence observed ...