Equilibrium magnetic states in individual hemispherical permalloy caps | Zendy

Robert Streubel | Zendy; Volodymyr P. Kravchuk | Zendy; Denis D. Sheka | Zendy; Denys Makarov | Zendy; Florian Kronast | Zendy; Oliver G. Schmidt | Zendy; Yuri Gaididei | Zendy

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Equilibrium magnetic states in individual hemispherical permalloy caps

Author(s) -

Robert Streubel,

Volodymyr P. Kravchuk,

Denis D. Sheka,

Denys Makarov,

Florian Kronast,

Oliver G. Schmidt,

Yuri Gaididei

Publication year - 2012

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4756708

Subject(s) - permalloy , magnetic circular dichroism , magnetic force microscope , condensed matter physics , magnetization , materials science , magnetic domain , x ray magnetic circular dichroism , magnetism , phase diagram , magnetic field , phase (matter) , physics , quantum mechanics , astronomy , spectral line

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.

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