Abstract
In order to realize a perpendicular exchange bias for applications, a robust and tunable exchange bias is required for spintronic applications. Here, we show the perpendicular exchange energy (PEE) in the TbxCo100−x/Cu/[Co/Pt]2 heterostructures. The structure consists of amorphous ferrimagnetic Tb–Co alloy films and ferromagnetic Co/Pt multilayers. The dependence of the PEE on the interlayer thickness of Cu and the composition of Tb–Co were analyzed. We demonstrate that the PEE can be controlled by changing the Cu interlayer thickness of 0.2 < tCu < 0.3 (nm). We found that PEE reaches a maximum value (σPw = 1 erg/cm2) at around x = 24%. We, therefore, realize the mechanism of PEE in the TbxCo100−x/Cu/[Co/Pt]2 heterostructures. We observe two competing mechanisms—one leading to an increase and the other to a decrease—which corresponds to the effect of Tb content on saturation magnetization and the coercivity of heterostructures. Sequentially, our findings show possibilities for both pinned layers in spintronics and memory device applications by producing large PEE and controlled PEE by Cu thickness, based on TbxCo100−x/Cu/[Co/Pt]2 heterostructures.
Highlights
In order to realize a perpendicular exchange bias for applications, a robust and tunable exchange bias is required for spintronic applications
We observe two competing mechanisms—one leading to an increase and the other to a decrease—which corresponds to the effect of Tb content on saturation magnetization and the coercivity of heterostructures
The exchange bias (EB) phenomenon was discovered more than half a century ago by Meiklejohn and Bean [1]
Summary
In order to realize a perpendicular exchange bias for applications, a robust and tunable exchange bias is required for spintronic applications. Shows the loops were measured using the polar-magnetooptical Kerr effect at hysteresis room temperature for three single-layer samples, a [Co/Pt]2 optical Tb–Co single-layer polarity of the hysteresis is negative, as in Co/Pt. On the other hand, in the RE-rich sample
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