Scaling analysis and application: Phase diagram of magnetic nanorings and elliptical nanoparticles

Journal Article · Tue Apr 01 04:00:00 UTC 2008 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.77.144428· OSTI ID:21143273

Wen, Zhang; Singh, Rohit; Bray-Ali, Noah; Haas, Stephan ^[1]

---

1. Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089 (United States)

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 the assumption of incomplete self-similarity. It is used to obtain phase diagrams of magnetic nanoparticles featuring three competing configurations: in-plane ferromagnetism, 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 and outer and inner radii. The triple points in these phase diagrams are shown to be in a 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 where the double vortex is a stable ground state are identified.

• OSTI ID: 21143273
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 14 Vol. 77; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
CYLINDRICAL CONFIGURATION
FERROMAGNETISM
GROUND STATES
MAGNETIC PROPERTIES
NANOSTRUCTURES
PARTICLES
PHASE DIAGRAMS
RINGS
SCALING
THREE-DIMENSIONAL CALCULATIONS
TRIPLE POINT
VORTICES