Equilibrium magnetic states in individual hemispherical permalloy caps

Journal Article · Mon Sep 24 00:00:00 EDT 2012 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4756708· OSTI ID:22080462

Streubel, Robert; Schmidt, Oliver G ^[1]; Kravchuk, Volodymyr P; Gaididei, Yuri ^[2]; Sheka, Denis D ^[3]; Makarov, Denys ^[1]; Kronast, Florian ^[4]

---

1. Institute for Integrative Nanosciences, IFW Dresden, 01069 Dresden (Germany)
2. Bogolyubov Institute for Theoretical Physics, 03143 Kiev (Ukraine)
3. Radiophysics Faculty, Taras Shevchenko National University of Kiev, 01601 Kiev (Ukraine)
4. Helmholtz-Zentrum Berlin fuer Materialien und Energie GmbH, 12489 Berlin (Germany)

The magnetization distributions in individual soft magnetic permalloy caps on non-magnetic spherical particles with sizes ranging from 50 to 800 nm are investigated. We experimentally visualize the magnetic structures at the resolution limit of the x-ray magnetic circular dichroism photoelectron emission microscopy (XMCD-PEEM). By analyzing the so-called tail contrast in XMCD-PEEM, the spatial resolution is significantly enhanced, which allowed us to explore magnetic vortices and their displacement on curved surfaces. Furthermore, cap nanostructures are modeled as extruded hemispheres to determine theoretically the phase diagram of equilibrium magnetic states. The calculated phase diagram agrees well with the experimental observations.

• OSTI ID: 22080462
• Journal Information: Applied Physics Letters, Vol. 101, Issue 13; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COMPUTERIZED SIMULATION
EMISSION SPECTROSCOPY
EQUILIBRIUM
MAGNETIC CIRCULAR DICHROISM
MAGNETIC FLUX
MAGNETIC MATERIALS
MAGNETIZATION
MICROSCOPY
NANOSTRUCTURES
PARTICLE SIZE
PERMALLOY
PHASE DIAGRAMS
SPATIAL RESOLUTION
X RADIATION
X-RAY PHOTOELECTRON SPECTROSCOPY