超薄L10-FePt/MgO/[Co/Pd]30磁隧道结的层间耦合

Magnetics Symposium 2014 - Celebrating 50th Anniversary of IEEE Magnetics Society (MSSC50) Pub Date : 2014-11-06 DOI:10.1109/MSSC.2014.6947690

P. Ho, G. Han, G. Chow, Jingsheng Chen

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引用次数: 0

摘要

制备了垂直磁各向异性L10-FePt/MgO/[Co/Pd]30层厚度为1 ~ 4 nm的超薄L10-FePt磁隧道结(MTJs)。超薄的L10-FePt为自由层，较厚较硬的[Co/Pd]30为固定层。L10-FePt层厚为4 nm时，MTJ层间耦合主要为静磁耦合和针孔直接耦合。在L10-FePt/MgO/[Co/Pd]30 MTJ中，层间耦合场的大小与之前报道的基于L10-FePt的伪自旋阀相比微不足道。由于固定[Co/Pd]30层的单畴特性，也没有偶极杂散场耦合的迹象。

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Interlayer coupling in ultra-thin L10-FePt/MgO/[Co/Pd]30 magnetic tunnel junctions

Perpendicular magnetic anisotropy L1₀-FePt/MgO/[Co/Pd]₃₀ magnetic tunnel junctions (MTJs) with ultra-thin L1₀-FePt layer of thickness 1 to 4 nm were fabricated and studied. The ultra-thin L1₀-FePt behaved as the free layer while the thicker and harder [Co/Pd]₃₀ behaved as the fixed layer. The interlayer coupling within the MTJ with L1₀-FePt layer thickness of 4 nm was attributed mainly to magnetostatic coupling and direct coupling due to pinholes. The magnitude of the interlayer coupling field in the L1₀-FePt/MgO/[Co/Pd]₃₀ MTJ was insignificant compared to the L1₀-FePt based pseudo spin valves reported earlier. There was also no sign of dipolar stray field coupling, owing to the single domain characteristic property of the fixed [Co/Pd]₃₀ layer.

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Magnetics Symposium 2014 - Celebrating 50th Anniversary of IEEE Magnetics Society (MSSC50)

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