23 research outputs found
A stable path to ferromagnetic hydrogenated graphene growth
In this paper, we propose a practical way to stabilize half-hydrogenated
graphene (graphone). We show that the dipole moments induced by an
hexagonal-boron nitride (h-BN) substrate on graphene stabilize the hydrogen
atoms on one sublattice of the graphene layer and suppress the migration of the
absorbed hydrogen atoms. Based upon first principle spin polarized density of
states (DOS) calculations, we show that the half hydrogenated graphene
(graphone) obtained in different graphene-h-BN heterostructures exhibits a half
metallic state. We propose to use this new exotic material for spin valve and
other spintronics devices and applications.Comment: 8 pages, 8 figure
Skyrmion in a real magnetic film
Journals published by the American Physical Society can be found at http://journals.aps.org/Skyrmions are magnetic defects in ultrathin magnetic films, similar to the bubble domains in the thicker films. Even weak uniaxial anisotropy determines their radii unambiguously. We derive equations of slow dynamics for Skyrmions. We show that the discreteness of the lattice in an isotropic two-dimensional magnet leads to a slow rotation of the local magnetization in the Skyrmion and even a small dissipation leads to decay of the Skyrmion. The radius of such a Skyrmion as a function of time is calculated. We prove that uniaxial anisotropy stabilizes the Skyrmion and study the relaxation process. [S0163-1829(98)50438-9]