First-order reversal curve (FORC) diagram, which visualizes the variation of magnetic interaction on a field plane, has been applied to nanocrystalline Ce-Fe-B melt-spinning ribbons. The FORC diagram exhibits different vertical spread along Hu axis when is parallel or perpendicular ribbon surface. discrepancy corresponds intergranular interactions, can also be verified by Henkel plot, another m...

The influence of magnetic interactions on the anisotropy of magnetic susceptibility (AMS) have been largely studied by several theoretical models or experiments. Numerical models have shown that when magnetostatic interactions occur, the distributions of particles over the volume rather than their individual orientations control the AMS. We have shown recently from a comprehensive rock magnetic...

We solve the Einstein-Maxwell-Klein-Gordon system of equations and derive a compact, static axially symmetric magnetized object which is electrically neutral made two complex massive-charged scalar fields. describe several properties such solution, including torus form matter density expected dipolar distribution magnetic field, with some peculiar features in central regions. The solution shows...

We investigate the collective gyrotropicmodes in a linear chain of ferromagnetic nanodots in a skyrmionmagnetization state. Individual skyrmions in the dots (with thickness about of 1 nmand radius about of 100 nm) are assumed to be stabilized by interplay of isotropic exchange and Dzyaloshinskii-Moriya exchange interactions,magnetic anisotropy andmagnetostatic interactions. We consider the dipo...

An overview of the magnetostatic field synthesis method, Variable Field Generation (VFG), and results from applying it to a test case to design magneto-plasma-aerodynamic (MPAD) devices to observe algorithm performance in the MATLAB programming environment are presented in this paper. The algorithm applied to this test case included integrating the Magnetostatic module of the finite element sof...

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We report an all-optical time-domain detection of picosecond magnetization dynamics of arrays of 50 nm Ni(80)Fe(20) (permalloy) dots down to the single nanodot regime. In the single nanodot regime the dynamics reveals one dominant resonant mode corresponding to the edge mode of the 50 nm dot with slightly higher damping than that of the unpatterned thin film. With the increase in areal density ...

A model for single-domain uniaxial ferromagnetic particles with high anisotropy, the Ising model, is studied. Recent experimental observations have been made of the probability that the magnetization has not switched, PNOT. Here an approach is described in which it is emphasized that a ferromagnetic particle in an unfavorable field is in fact a metastable system, and the switching is accomplish...

We study hysteretic phenomena in random ferromagnets. We argue that the angle dependent magnetostatic (dipolar) terms introduce frustration and long-range interactions in these systems. This makes it plausible that the Sherrington-Kirkpatrick (SK) model may be able to capture some of the relevant physics of these systems. We use scaling arguments, replica calculations, and large scale numerical...