Role of Shape Ellipticity on Dipole-Exchange Spin Waves in Ferromagnetic Nanorings

IF 1.1 4区 物理与天体物理 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC
Yassin Elmeligi;Bushra Hussain;Michael G. Cottam
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引用次数: 0

Abstract

The properties of the quantized spin-wave frequencies and the transition field between the two stable magnetization states (the low-field vortex state and the higher-field onion state) are studied for elliptical nanorings. The dependences of these quantities on the nanoring sizes and the degree of ellipticity are examined over a wide range of values for the applied magnetic field and its orientation. The novel effects introduced when the symmetry axes of the inner elliptical edges of the rings are rotated relative to those of the outer elliptical edge are also studied. To characterize these effects, our theory makes use of a Hamiltonian-based dipole-exchange methodology, adapted from that used to elucidate the spin-wave modes in circular nanorings. It is found that spin-wave frequencies and the behavior of the transition field(s) depend sensitively on the degree of ellipticity, the rotation angle of the inner elliptical edge with respect to the outer elliptical edge, and the direction of the applied field relative to the nanoring axes.
形状椭圆度对铁磁纳米环中偶极交换自旋波的作用
研究了椭圆形纳米环的量化自旋波频率和两种稳定磁化状态(低磁场涡旋态和高磁场洋葱态)之间的过渡磁场的特性。在应用磁场及其方向的广泛数值范围内,研究了这些量与纳米环尺寸和椭圆度的关系。此外,还研究了环的内椭圆边对称轴相对于外椭圆边对称轴旋转时产生的新效应。为了描述这些效应,我们的理论采用了基于哈密顿的偶极子交换方法,该方法改编自用于阐明圆纳米环中自旋波模式的方法。研究发现,自旋波频率和过渡场的行为敏感地取决于椭圆度、内椭圆边相对于外椭圆边的旋转角度以及相对于纳米环轴线的外加场方向。
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来源期刊
IEEE Magnetics Letters
IEEE Magnetics Letters PHYSICS, APPLIED-
CiteScore
2.40
自引率
0.00%
发文量
37
期刊介绍: IEEE Magnetics Letters is a peer-reviewed, archival journal covering the physics and engineering of magnetism, magnetic materials, applied magnetics, design and application of magnetic devices, bio-magnetics, magneto-electronics, and spin electronics. IEEE Magnetics Letters publishes short, scholarly articles of substantial current interest. IEEE Magnetics Letters is a hybrid Open Access (OA) journal. For a fee, authors have the option making their articles freely available to all, including non-subscribers. OA articles are identified as Open Access.
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