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首页> 外文期刊>The journal of physics and chemistry of solids >Magnetic reversal mechanism in strong perpendicular magnetic anisotropic CoPt/AIN multilayer film
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Magnetic reversal mechanism in strong perpendicular magnetic anisotropic CoPt/AIN multilayer film

机译：强垂直磁各向异性CoPt / AIN多层膜的磁反转机理

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摘要

Magnetic reversal mechanism of the Sub/AIN5 nm/[CoPt2 nm/AlN5 nm]_5 nano multilayer film,which shows strong perpendicular magnetic anisotropy (K_u=6.7 × 10~6 erg/cm~3), has been studied. The angle- dependent magnetic hysteresis loops of this highly perpendicular anisotropic CoPt/AIN multilayer film were measured in the present work, applying a magnetic field along different angles φ with respect to the film normal. It demonstrates that the magnetic reversal of the CoPt ultrathin layers in the CoPt/AIN multilayer film is occurred by the reversible magnetization rotation and the irreversible displacement of domain walls. The φ-dependent part of coercive field is resulted from the internal stress according to the Kondorsky and Kersten model. The φ-independent part of coercive field implies some random and isotropy pinning centers (e.g., vacancies, dislocations, grain boundaries) in the ultrathin CoPt layers. Our work is useful for coercivity control of metal/ceramics layered structures, in particular the perpendicular magnetic tunneling junctions.
机译：研究了Sub / AIN5 nm / [CoPt2 nm / AlN5 nm] _5纳米多层膜的磁反转机理，该膜表现出很强的垂直磁各向异性（K_u = 6.7×10〜6 erg / cm〜3）。在本工作中，通过沿相对于薄膜法线的不同角度φ施加磁场，测量了这种高度垂直的各向异性CoPt / AIN多层薄膜的角度相关的磁滞回线。这表明，CoPt / AlN多层膜中CoPt超薄层的磁性反转是由可逆的磁化旋转和畴壁的不可逆位移引起的。根据Kondorsky和Kersten模型，矫顽场的φ相关部分是由内部应力产生的。矫顽场的φ独立部分意味着超薄CoPt层中存在一些随机且各向同性的钉扎中心（例如空位，位错，晶界）。我们的工作对于金属/陶瓷层状结构，特别是垂直磁隧道结的矫顽力控制很有用。

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