Sadhukhan Banasree
Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, 603203 Chennai, Tamil Nadu, India.
Tata Institute of Fundamental Research, Hyderabad, Telangana 500046, India.
J Phys Condens Matter. 2024 Dec 19;37(9). doi: 10.1088/1361-648X/ad9da8.
Skyrmions having topologically protected field configurations with particle-like properties play an important role in various fields of science. Our present study focus on the generation of skyrmion from spin spiral in the magnetic multilayers of 4d/Fe/Ir(111) with 4d = Y, Zr, Nb, Mo, Ru, Rh. Here we investigate the impact of 4d transition metals on the isotropic Heisenberg exchanges and anti-symmetric Dzyaloshinskii-Moriya interactions originating from the broken inversion symmetry at the interface of 4d/Fe/Ir(111) multilayers. We find a strong exchange frustration due to the hybridization of the Fe-3d layer with both 4d and Ir-5d layers which modifies due to band filling effects of the 4d transition metals. We strengthen the analysis of exchange frustration by shedding light on the orbital decomposition of isotropic exchange interactions of Fe-3d orbitals. Our spin dynamics and Monte Carlo simulations indicate that the magnetic ground state of 4d/Fe/Ir(111) transition multilayers is a spin spiral in the-plane with a period of 1 to 2.5 nm generated by magnetic moments of Fe atoms and propagating along the-direction. The spiral wavelengths in Y/Fe/Ir(111) are much larger compared to Rh/Fe/Ir(111). In order to manipulate the skyrmion phase in 4d/Fe/Ir(111), we investigate the magnetic ground state of 4d/Fe/Ir(111) transition multilayers with different external magnetic field. An increasing external magnetic field of ∼12 T is responsible for deforming the spin spiral into a isolated skyrmion which flips into skyrmion lattice phase around ∼18 T in Rh/Fe/Ir(111). Our study predict that the stability of magnetic skyrmion phase in Rh/Fe/Ir(111) against thermal fluctuations is upto temperature⩽90 K.
具有类粒子性质的拓扑保护场构型的斯格明子在多个科学领域发挥着重要作用。我们目前的研究聚焦于在4d = Y、Zr、Nb、Mo、Ru、Rh的4d/Fe/Ir(111)磁性多层膜中由自旋螺旋产生斯格明子。在此，我们研究4d过渡金属对源于4d/Fe/Ir(111)多层膜界面处反演对称性破缺的各向同性海森堡交换和反对称Dzyaloshinskii-Moriya相互作用的影响。我们发现由于Fe-3d层与4d和Ir-5d层的杂化导致了强烈的交换失稳，而这种杂化会因4d过渡金属的能带填充效应而改变。我们通过阐明Fe-3d轨道各向同性交换相互作用的轨道分解来加强对交换失稳的分析。我们的自旋动力学和蒙特卡罗模拟表明，4d/Fe/Ir(111)过渡多层膜的磁基态是由Fe原子磁矩产生的、沿方向传播的、面内周期为1至2.5纳米的自旋螺旋。与Rh/Fe/Ir(111)相比，Y/Fe/Ir(111)中的螺旋波长要大得多。为了操控4d/Fe/Ir(111)中的斯格明子相，我们研究了不同外部磁场下4d/Fe/Ir(111)过渡多层膜的磁基态。约12 T的外部磁场增加会使自旋螺旋变形为孤立的斯格明子，在Rh/Fe/Ir(111)中，约18 T时会翻转成斯格明子晶格相。我们的研究预测，Rh/Fe/Ir(111)中磁性斯格明子相对热涨落的稳定性可达温度⩽90 K。
