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Spin Rotation (spin + rotation)

Distribution by Scientific Domains
Physics and Astronomy100%

Selected Abstracts

Microscopic study of carrier transport in the organic semiconductor zinc-phthalocyanine

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 3-4 2010
Joćo Piroto Duarte
Abstract Nominally undoped zinc-phthalocyanine (ZnPc) was investigated using Muon Spin Rotation (,SR) to probe microscopic carrier transport properties. The study focused on the relaxation of the positive muon's polarisation produced by spin-flip scattering with charge carriers. An energy of 71(8) meV was found for the temperature activation of carrier jumps, a value that does not match the activation energies known in ZnPc from electrical measurements, and that was attributed to a fast transport component in this material. (© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

The influence of dipolar interaction on magnetic properties in nanomagnets with different shapes

PHYSICA STATUS SOLIDI (B) BASIC SOLID STATE PHYSICS, Issue 5 2010
Ying Li
Abstract With the Monte Carlo method, we investigate the magnetic properties of four nanomagnets of different shapes, i.e., the circular-shaped, the square-shaped, the elliptical, and the ring-shaped nanomagnets. A systematic study of the effects of the dipolar interaction on the magnetic configurations is performed in these nanomagnets, and further the coercive field and the remanence as a function of dipolar interaction are analyzed. The results show that the magnetic configuration and thus the magnetization reversal process of nanomagnets are dependent strongly on the strength of dipolar interactions. For the case of small dipolar interaction, the magnetization reversal process is mainly dominated by spin rotation, while the reversal transforms to the vortex nucleation and propagation formations with increasing dipolar interaction. Moreover, if the dipolar interaction is neglected in the calculation of the total energy, no clear difference is found among hysteresis loops of four nanomagnets with same areas, but the inclusion of dipolar interaction can lead to different hysteresis loops for nanomagnets with same areas but different shapes. This indicates that the dipolar interaction is important for accounting for the shape effect of the magnetic properties in nanomagnets. [source]

Mechanically detected field-induced Mn spin rotation in GaMnAs

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 9 2008
Koji Onomitsu
Abstract To study the magnetization properties of a micron-sized GnMnAs film, we characterize the mechanical properties of a micro-cantilever integrating a GaMnAs Hall bar. The magnetic field dependence of its mechanical resonance frequency below the Curie temperature is remarkably different from that above the Curie temperature. The frequency shift, which reflects the field-induced Mn spin rotation, is mainly caused by the magnetoelastic coupling. This result demonstrates that a micromechanical cantilever is a powerful tool for investigating the magnetic properties of micrometer-sized ferromagnetic materials. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]