We have studied the magnetic exchange coupling in an antiferromagnetic(AFM)/ferromagnetic(FM) IrMn[10 nm]/NiFe[5 nm] bilayer and in arrays of dots with different size (1000, 500, 300 nm). The coupling mechanism is governed by the AFM spins at the interface between the FM phase and the bulk of the AFM layer. They exhibit a sort of re-entrant antiferromagnetic behavior --- passing from a disordered frozen collective regime (T<100 K) to a high-temperature one, where they are polarized by the bulk AFM spins --- determining the strength of their torque action on the FM spins.
Re-entrant antiferromagnetism in the exchange-coupled IrMn/NiFe system
DEL BIANCO, Lucia;BONFIGLIOLI, Edgar;CHINNI, Federico;TAMISARI, Melissa;SPIZZO, Federico
2015
Abstract
We have studied the magnetic exchange coupling in an antiferromagnetic(AFM)/ferromagnetic(FM) IrMn[10 nm]/NiFe[5 nm] bilayer and in arrays of dots with different size (1000, 500, 300 nm). The coupling mechanism is governed by the AFM spins at the interface between the FM phase and the bulk of the AFM layer. They exhibit a sort of re-entrant antiferromagnetic behavior --- passing from a disordered frozen collective regime (T<100 K) to a high-temperature one, where they are polarized by the bulk AFM spins --- determining the strength of their torque action on the FM spins.File in questo prodotto:
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