论文标题
具有有限磁各向异性的交换耦合双层的无滞后磁化逆转
Hysteresis-free magnetization reversal of exchange-coupled bilayers with finite magnetic anisotropy
论文作者
论文摘要
由铁磁和铁磁层组成的交换耦合结构在技术上变得越来越重要。我们通过实验表明[CO（0.2 nm）/Ni（0.4 nm）/pt（0.6 nm）] $ _ n $多层交换偶联到20 nm厚的Ferrimagnetic TB $ _ {28} $ co $ _ $ ______________________________________________________________28} $ _ {28} $ ____________________固定层。此外，我们通过微磁模拟介绍了详细的理论研究，最重要的是纯粹的分析推导，用于磁化反转中完全可逆性的状况。如果在铁磁层的逆转过程中形成域壁并产生一个固有的硬轴偏置场，从而克服铁磁层的磁各向异性场，总是会发生无滞后环。衍生的条件进一步表明，磁各向异性和两层的大量交换，以及交换耦合强度和铁磁层的厚度对于其可逆性起着重要作用。
Exchange-coupled structures consisting of ferromagnetic and ferrimagnetic layers become technologically more and more important. We show experimentally the occurrence of completely reversible, hysteresis-free minor loops of [Co(0.2 nm)/Ni(0.4 nm)/Pt(0.6 nm)]$_N$ multilayers exchange-coupled to a 20 nm thick ferrimagnetic Tb$_{28}$Co$_{14}$Fe$_{58}$ layer, acting as hard magnetic pinning layer. Furthermore, we present detailed theoretical investigations by means of micromagnetic simulations and most important a purely analytical derivation for the condition of the occurrence of full reversibility in magnetization reversal. Hysteresis-free loops always occur if a domain wall is formed during the reversal of the ferromagnetic layer and generates an intrinsic hard-axis bias field that overcomes the magnetic anisotropy field of the ferromagnetic layer. The derived condition further reveals that the magnetic anisotropy and the bulk exchange of both layers, as well as the exchange coupling strength and the thickness of the ferromagnetic layer play an important role for its reversibility.
