Dynamic symmetry loss of high-frequency hysteresis loops in single-domain particles with uniaxial anisotropy
نویسندگان
چکیده
منابع مشابه
Reversal time of the magnetization of single-domain ferromagnetic particles with mixed uniaxial and cubic anisotropy
The reversal time of the magnetization of single-domain ferromagnetic particles is estimated for mixed uniaxial and cubic anisotropy energies possessing nonparaboloidal saddles and well bottoms or either. The calculation generalizes the existing adaptation of the Kramers escape rate theory to fine ferromagnetic particles with nonaxially symmetric magnetocrystalline-Zeeman energies, originally b...
متن کاملEffects of surface anisotropy on hysteresis in fine magnetic particles.
We solve numerically the dissipative Landau-LifshitzGilbert equations to consider hysteresis in fine magnetic particles. Finite size effects are studied for two models with uniaxial anisotropy — bulk random axis and surface anisotropy only. It is demonstrated that the latter model introduces considerable effects for small enough particles when the coupling to the anisotropy is equal or greater ...
متن کاملDynamic fluorescence anisotropy imaging microscopy in the frequency domain (rFLIM).
We describe a novel variant of fluorescence lifetime imaging microscopy (FLIM), denoted anisotropy-FLIM or rFLIM, which enables the wide-field measurement of the anisotropy decay of fluorophores on a pixel-by-pixel basis. We adapted existing frequency-domain FLIM technology for rFLIM by introducing linear polarizers in the excitation and emission paths. The phase delay and intensity ratios (AC ...
متن کاملSteps in the hysteresis loops of a high-spin molecule
We report the first observation of steps in the hysteresis loop of a high-spin molecular magnet. We propose that the steps, which occur every 0.46 T, are due to thermally assisted resonant tunneling between different quantum spin states. Magnetic relaxation increases dramatically when the field is in the neighborhood of a step. A simple model accounts for the observations and predicts a value f...
متن کاملTransverse and vortex domain wall structure in magnetic nanowires with uniaxial in-plane anisotropy.
Micromagnetic and analytical models are used to investigate how in-plane uniaxial anisotropy affects transverse and vortex domain walls in nanowires where shape anisotropy dominates. The effect of the uniaxial anisotropy can be interpreted as a modification of the effective wire dimensions. When the anisotropy axis is aligned with the wire axis (θ(a) = 0), the wall width is narrower than when n...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Magnetism and Magnetic Materials
سال: 2012
ISSN: 0304-8853
DOI: 10.1016/j.jmmm.2011.08.022