Temperature Dependence of the Exchange Anisotropy of a GdFeCo Ferrimagnetic Film Coupled to the IrMn Antiferromagnet
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The uniaxial anisotropy and kinetics of the transformation of the domain structure in a ferrimagnetic GdFeCo film exchange-coupled to the IrMn antiferromagnet have been studied in a wide temperature range. Ta/Pt/GdFeCo/IrMn/Pt multilayer structures with perpendicular magnetic anisotropy demonstrate the compensation of the sublattice magnetization at K and K. Nonmonotonic temperature dependences of the exchange bias field HEX and coercivity HC are revealed. It is established that the slope of the dependence and the quantity HEX change sign at T1. An orientational phase transition is detected at a temperature of TCR = 35 K, below which uniaxial anisotropy, as well as the mechanism of coercive force formation, changes.
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