Exponential Dependence of Interlayer Exchange Coupling in Fe/MgO(001) Superlattices on Temperature
Abstract
The interlayer exchange coupling in Fe/MgO(001) superlattices is found to increase exponentially with decreasing temperature. Around 150~K, the field induced response changes from discrete switching, governed by field-driven domain propagation, to a collective rotation of the magnetic layers. This transition is accompanied by a change in the magnetic ground state from 180 (antiferromagnetic) to 90 alignment between adjacent Fe layers. These effects are argued to arise from quantum well states, defined by the total thickness of the samples.
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