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In ferromagnet (FM)/antiferromagnet (AF) bilayer systems, it was recently found that the exchange bias vs. FM thickness curve shows a critical thickness below which the exchange bias vanishes, and confirmed by analytic calculation using a simplified model that it can be ascribed to the superparamagnetism (SPM) promoted through the exchange coupling with the AF layer. This paper studies the effect...
The authors study the effect of the interface on the coercivity Hc and the exchange field Hex in CoFe/IrMn systems by comparing the contribution of the interfacial area and the ferromagnetic layer thickness. It is shown that the exchange field only depends on the intrinsic coupling at the interface and thermal effects. By increasing activation temperature TACT, the amount of antiferromagnetic material...
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