Equilibrium magnetic states in individual hemispherical permalloy caps

Authors

• Robert Streubel, Leibniz-Institut für Festkörper- und Werkstoffforschung DresdenFollow
• Volodymyr P. Kravchuk, Bogolyubov Institute for Theoretical Physics Nasu
• Denis D. Sheka, Taras Shevchenko National University of Kyiv
• Denys Makarov, Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden
• Florian Kronast, Helmholtz-Zentrum Berlin für Materialien und Energie (HZB)
• Oliver G. Schmidt, Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden
• Yuri Gaididei, Bogolyubov Institute for Theoretical Physics Nasu

Document Type

Article

Date of this Version

9-24-2012

Citation

Appl. Phys. Lett. 101, 132419 (2012);

https://doi.org/10.1063/1.4756708

Comments

© 2012 American Institute of Physics. Used by permission.

Abstract

The magnetization distributions in individual soft magnetic permalloy caps on non-magnetic spherical particles with sizes ranging from 50 to 800nm 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. © 2012 American Institute of Physics.