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This paper investigates how the current distribution and ac losses of second-generation high-temperature superconducting (2G HTS) pancake coils are affected by the material anisotropy. The 2G HTS tape has a strong anisotropy, which means that its critical current densities are different at different magnetic field orientations. 2G HTS pancake coils with different anisotropies have different ac losses...
In the mixed states of type II superconductors, one of the most fascinating research topics is the vortex phase transition from a vortex-glass phase to a vortex liquid phase with variations of temperatures or magnetic fields.[1] Recently, the discovery of iron-based superconductors opens a new route to investigate the phase transition. However, the influence of magnetic field orientation on the vortex...
Spin-torque oscillator (STO) with reference layer (REF) has been proposed to be an efficient way to excite oscillation at low current density [1-2]. A well-controlled STO is the center part of microwave assisted magnetic recording (MAMR); however, in the recording process, the STO is exposed in an alternative external head field in addition to the applied current [3-4]. To assist the writing in MAMR,...
In this paper, we investigate the switching property of perpendicular media in microwave-assisted magnetic recording by utilizing micromagnetic modeling, in which circularly polarized magnetic field at microwave frequencies is applied. This paper presents understanding of the switching dependence on the inter-granular exchange coupling field and the distribution of anisotropy field. The result shows...
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