Abstract
Irreversibility in magnetization has been measured at fixed magnetic fields, H≤70kOe, on Cr70Fe30 thin films. The observed variations of the weak and strong irreversibility temperatures with the external magnetic field in the ferromagnetic (FM) and re-entrant (RE) regimes, respectively, reveal that both the FM and RE states are mixed phases in which longitudinal FM order coexists with a transverse spin glass order. However, the RE state distinguishes itself from the FM one in a strong mixing of the longitudinal and transverse spin components caused by strong random anisotropy. The pinning of domain walls at the magnetic inhomogeneities is the common cause of coercivity and the irreversibility in magnetization.
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