Journal ArticleDOI
Ferromagnetic Resonance in Thin Films. I. Theory of Normal-Mode Frequencies
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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
Magnon focusing in thin ferromagnetic films
V. Veerakumar,Robert E. Camley +1 more
TL;DR: In this paper, the focusing of bulk and surface spin waves in thin ferromagnetic films was studied by first solving the implicit dispersion relation obtained from the magnetostatic Maxwell equations and then obtaining slowness surfaces for the first four bulk modes and one surface mode.
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Electrical Detection of Magnetization Dynamics via Spin Rectification Effects
TL;DR: In this article, the authors review the current status of a frontier in dynamic spintronics and contemporary magnetism, in which much progress has been made in the past decade, based on the creation of a variety of micro- and nano-structured devices that enable electrical detection of magnetization dynamics.
Journal ArticleDOI
Elementary spin excitations in ultrathin itinerant magnets
TL;DR: In this article, the concept of spin excitations in ultrathin itinerant magnets is discussed and reviewed, and the effect of relativistic spin-orbit coupling on high-energy magnons is addressed.
Journal ArticleDOI
Non-reciprocity of dipole-exchange spin waves in thin ferromagnetic films
TL;DR: In this paper, it was shown that the fundamental mode of the dipole-exchange spectrum is localized at the film surface opposite to the surface of localization of the exchange-free Damon-Eshbach surface wave.
Journal ArticleDOI
Brillouin light scattering investigation of dynamic spin modes confined in cylindrical Permalloy dots
TL;DR: In this paper, the quantized mode spectrum of standing spin waves and edge modes in cylindrical Permalloy dots with a radius R in the range between 100 and 500 nm, thickness $L=50\mathrm{nm},$ and separation $2R,$ is examined from both experimental and theoretical points of view.