Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-09-25
Phys Rev B 77, 144428 (2008),
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages, 7 figures; added references, and discussion, as suggested by referees
Scientific paper
10.1103/PhysRevB.77.144428
The magnetic properties of single-domain nanoparticles with different geometric shapes, crystalline anisotropies and lattice structures are investigated. A recently proposed scaling approach is shown to be universal and in agreement with dimensional analysis coupled with an assumption of {\em incomplete} self-similarity. It is used to obtain phase diagrams of magnetic nanoparticles featuring three competing configurations: in-plane and out-of-plane ferromagnetism and vortex formation. The influence of the vortex core on the scaling behavior and phase diagram is analyzed. Three-dimensional phase diagrams are obtained for cylindrical nanorings, depending on their height, outer and inner radius. The triple points in these phase diagrams are shown to be in linear relationship with the inner radius of the ring. Elliptically shaped magnetic nanoparticles are also studied. A new parametrization for double vortex configurations is proposed, and regions in the phase diagram are identified where the double vortex is a stable ground state.
Bray-Ali Noah
Haas Stephan
Singh Rohit
Zhang Wen
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