1,378 research outputs found
Spin-orbit field switching of magnetization in ferromagnetic films with perpendicular anisotropy
As an alternative to conventional magnetic field, the effective spin-orbit
field in transition metals, derived from the Rashba field experienced by
itinerant electrons confined in a spatial inversion asymmetric plane through
the s-d exchange interaction, is proposed for the manipulation of
magnetization. Magnetization switching in ferromagnetic thin films with
perpendicular magnetocrystalline anisotropy can be achieved by current induced
spin-orbit field, with small in-plane applied magnetic field. Spin-orbit field
induced by current pulses as short as 10 ps can initiate ultrafast
magnetization switching effectively, with experimentally achievable current
densities. The whole switching process completes in about 100 ps.Comment: 4 pages, 3 figure
About the global magnetic fields of stars
We present a review of observations of the stellar longitudinal (effective)
magnetic field () and its properties. This paper also discusses
contemporary views on the origin, evolution and structure of .Comment: Plenary report, The Gamov International Astronomical Conference, XIII
ODESSA, 19-25 August, 2013, Odessa, Ukrain
Spin-Orbit Coupling and Tunneling Current in a Parabolic Quantum Dot
We propose a novel approach to explore the properties of a quantum dot in the
presence of the spin-orbit interaction and in a tilted magnetic field. The
spin-orbit coupling within the quantum dot manifest itself as anti-crossing of
the energy levels when the tilt angle is varied. The anti-crossing gap has a
non-monotonic dependence on the magnitude of the magnetic field and exhibits a
peak at some finite values of the magnetic field. From the dependence of the
tunneling current through the quantum dot on the bias voltage and the tilt
angle, the anti-crossing gap and most importantly the spin-orbit strength can
be uniquely determined
Turbulence in Binary Bose-Einstein Condensates Generated by Highly Non-Linear Rayleigh-Taylor and Kelvin-Helmholtz Instabilities
Quantum turbulence (QT) generated by the Rayleigh-Taylor instability in
binary immiscible ultracold 87Rb atoms at zero temperature is studied
theoretically. We show that the quantum vortex tangle is qualitatively
different from previously considered superfluids, which reveals deep relations
between QT and classical turbulence. The present QT may be generated at
arbitrarily small Mach numbers, which is a unique property not found in
previously studied superfluids. By numerical solution of the coupled
Gross-Pitaevskii equations we find that the Kolmogorov scaling law holds for
the incompressible kinetic energy. We demonstrate that the phenomenon may be
observed in the laboratory.Comment: Revised version. 7 pages, 8 figure
Massive Spin Collective Mode in Quantum Hall Ferromagnet
It is shown that the collective spin rotation of a single Skyrmion in quantum
Hall ferromagnet can be regarded as precession of the entire spin texture in
the external magnetic field, with an effective moment of inertia which becomes
infinite in the zero g-factor limit. This low-lying spin excitation may
dramatically enhance the nuclear spin relaxation rate via the hyperfine
interaction in the quantum well slightly away from filling factor equal one.Comment: 4 page
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