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The coercivity of the coupled NiFeCo thin films is a function of nickel-iron-cobalt (NiFeCo) film thickness and tantalum nitride (TaN) intermediate layer thickness. This can be attributed to the variation of energy and magnetization gradients of a domain wall. The magnetization gradient can be affected by a thickness-induced coupling effect associated with altering the exchange and magnetostatic interactions between the two NiFeCo films. Decreasing the exchange coupling and increasing the magnetostatic coupling between the coupled NiFeCo films tends to decrease the energy and magnetization gradients of domain walls and results in decreased coercivity.
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Yeh et al. (1994) studied this question.
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