Geometry and magnetism of L10 nanostructures

Atomic and micromagnetic aspects of L10 magnetism

Atomic and continuum effects in L10 magnets are investigated. Emphasis is on the competition between ferromagnetism, antiferromagnetism, and noncollinear order in both perfect and imperfect structures, and on the temperature dependence of the magnetic anisotropy. The applicability of micromagnetic and atomistic approaches depends on the length scales involved, but there is a broad range of phen...

Magnetism of Nanostructures

Magnetism and electron transport of MnyGa (1 < y < 2) nanostructures

Nanostructured Mn y Ga ribbons with varying Mn concentrations including Mn 1.2 Ga, Mn 1.4 Ga, Mn 1.6 Ga, and Mn 1.9 Ga were prepared using arc-melting and melt-spinning followed by a heat treatment. Our experimental investigation of the nanostructured ribbons shows that the material with y ¼ 1.2, 1.4, and 1.6 prefers the tetragonal L1 0 structure and that with y ¼ 1.9 prefers the D0 22 structur...

Control of magnetism by interfacial strain in Ni/V2O3 nanostructures

Magnetic properties of thin films can be modified through proximity effects with multilayer structures. Materials that undergo both a structural phase transition (SPT) and a metal to insulator transition (MIT) have been used for this purpose. This crystallographic change induces a stress to the adjacent layer that changes the magnetic properties of the film through magnetoelastic anisotropy. Th...

Magnetism in all-carbon nanostructures with negative Gaussian curvature.

We apply the ab initio spin density functional theory to study magnetism in all-carbon nanostructures. We find that particular systems, which are related to schwarzite and contain no undercoordinated carbon atoms, carry a net magnetic moment in the ground state. We postulate that, in this and other nonalternant aromatic systems with negative Gaussian curvature, unpaired spins can be introduced ...