Effects of magnetic anisotropy on nanometric systems
In this thesis, we study the effect of perpendicular uniaxial magnetic anisotropy on the magnetic states present in nano-disks and magnetic nano-rings. For this purpose, three works were carried out: The first work studied the magnetic states present in a nano-ring with a perpendicular uniaxial magn...
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| Tipo de recurso: | tesis doctoral |
| Estado: | Versión publicada |
| Fecha de publicación: | 2021 |
| País: | Chile |
| OAI Identifier: | oai:repositorio.anid.cl:10533/252979 |
| Acceso en línea: | https://hdl.handle.net/10533/252979 |
| Access Level: | acceso abierto |
| Palabra clave: | Ciencias Naturales Ciencias Físicas Física de la Materia Condensada |
| Sumario: | In this thesis, we study the effect of perpendicular uniaxial magnetic anisotropy on the magnetic states present in nano-disks and magnetic nano-rings. For this purpose, three works were carried out: The first work studied the magnetic states present in a nano-ring with a perpendicular uniaxial magnetic anisotropy to the plane varying along the radius. Our results show that the states vortex, meron, knot, and out-of-plane can be observed depending on the geometry and anisotropy. The second work studied the magnetostatic interaction between two Bubble skyrmions. Each skyrmion was stabilized on a magnetic nano disk that presents a perpendicular uniaxial anisotropy to the plane. The magnetic profile depends on the anisotropy. Our results show that depending on how the disks are positioned, the magnetic parameters of the skyrmions vary differently. The last work studied the effect of anisotropy on the synchronization of an array of spin-torque nano-oscillators. These nano-oscillators are coupled by magnetostatic interaction. In the absence of currents, the free layer of each nano-oscillator is magnetized perpendicular to the plane, where anisotropy allows to reduce the magnetic field needed to stabilize the out-of-plane state. Furthermore, when a current distribution is considered, it was observed that anisotropy only modifies the amplitude of oscillations. The results obtained in these studies are expected to give further insight into magnetic anisotropy’s role in stabilizing magnetic configurations in nano-rings and nano-disks. In addition, these results can be used in neuromorphic computing, the design of information storage devices, and/or radio-frequency devices. |
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