Journal ArticleDOI
Ferromagnetic Resonance in Thin Films. I. Theory of Normal-Mode Frequencies
TLDR
In this article, a theory for the frequencies of the general ferromagnetic normal modes of a sample of arbitrary shape and size with both exchange and demagnetization energies included.Abstract:
A theory is developed for the frequencies of the general ferromagnetic normal modes of a sample of arbitrary shape and size with both exchange and demagnetization energies included. The frequencies of the modes of rectangular and circular films are calculated by casting the linearized equation of motion of the magnetization into the form of an eigenvalue equation, which is solved by a variational method. The results explain the experiments of Dillon, Besser, Sparks et al., Freedman and Brundle, and Voltmer in detail qualitatively and typically to within \ensuremath{\sim}5-10% quantitatively for the mode spacings, with possible exceptions for the first few low-order modes in some samples, for which several contributions to the line spacings are difficult to estimate accurately. Pinning the surface spins has little effect on the frequencies and intensities of magnetostatic modes (with negligible exchange energy). The theory has implications concerning the main-resonance position in finite films, and together with experiments, further verifies Portis's modespacing theory. A simple physical explanation of the results is given, and the relation of the results for for finite films to those for infinite films is given.read more
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Journal ArticleDOI
Nonlinear magneto-optic measurement of flux propagation dynamics in thin Permalloy films
TL;DR: In this article, the authors used a coplanar waveguide structure driven with broadband voltage pulses to study the propagation of magnetic flux pulses in a 250 nm Permalloy film with a phase velocity of 4.2×105 m/s and group velocity of 1.5×105m/s.
DissertationDOI
Long-range interactions, weak magnetic fields amplification, and end states for quantum computing
TL;DR: In this paper, the authors proposed an experimental realization of the NV-magnetometer which increases the sensitivity of the magnetometer to nuclear moments by four degrees of freedom, which is an unprecedented increase in the sensitivity.
Journal ArticleDOI
Magnetoresistive multipliers as a new base for watt-converters
TL;DR: A new magnetoresistive multiplier (MRM) element for use in watt-converters is presented, which has two independent inputs for two base components of the electromagnetic field: the transverse electric and magnetic components which determine the Poynting vector.
Journal ArticleDOI
Dipole-exchange spin waves in perpendicularly magnetized discs: Role of the Oersted field
Rodrigo Arias,D. L. Mills +1 more
TL;DR: In this article, the influence of the Oersted field on the spin-wave spectrum of a thin circular disc has been studied for the case where the magnetization is nominally perpendicular to the plane.
Journal ArticleDOI
Magnetostatic spin wave modes excitation in yttrium–iron–garnet film under various temperatures
TL;DR: In this paper, temperature-dependent magnetostatic spin wave modes spectra in a ferromagnetic thin film of yttrium-iron-garnet are investigated by means of conventional and photothermally modulated ferromagnetism resonance techniques.