Interplay between bulk and edge-bound topological defects in a square micromagnet

Sam D. Sloetjes; Einar Digernes; Fredrik K. Olsen; Rajesh V. Chopdekar; Scott T. Retterer; Erik Folven; Jostein K. Grepstad

doi:10.1063/1.5010166

Interplay between bulk and edge-bound topological defects in a square micromagnet

Sam D. Sloetjes, Einar Digernes, Fredrik K. Olsen, Rajesh V. Chopdekar, Scott T. Retterer, Erik Folven, Jostein K. Grepstad

Center for Nanophase Matls Sciences

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

A field-driven transformation of a domain pattern in a square micromagnet, defined in a thin film of La_0.7Sr_0.3MnO₃, is discussed in terms of creation and annihilation of bulk vortices and edge-bound topological defects with half-integer winding numbers. The evolution of the domain pattern was mapped with soft x-ray photoemission electron microscopy and magnetic force microscopy. Micromagnetic modeling, permitting detailed analysis of the spin texture, accurately reproduces the measured domain state transformation. The simulations also helped stipulate the energy barriers associated with the creation and annihilation of the topological charges and thus to assess the stability of the domain states in this magnetic microstructure.

Original language	English
Article number	042401
Journal	Applied Physics Letters
Volume	112
Issue number	4
DOIs	https://doi.org/10.1063/1.5010166
State	Published - Jan 22 2018

Funding

Part of this work was performed on the Surface/ Interface Microscopy (SIM) beamline of the Swiss Light Source, Paul-Scherrer-Institut in Villigen, Switzerland. We thank Dr. Armin Kleibert for helpful assistance with the X-PEEM measurements. We would also like to thank Jacob Linder, Johannes Skaar, and Gereon Quick for stimulating discussions. Partial funding for this work was obtained from the Norwegian Ph.D. Network on Nanotechnology for Microsystems, which is sponsored by the Research Council of Norway, Division for Science, under Contract No. 221860/F60.

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abstract = "A field-driven transformation of a domain pattern in a square micromagnet, defined in a thin film of La0.7Sr0.3MnO3, is discussed in terms of creation and annihilation of bulk vortices and edge-bound topological defects with half-integer winding numbers. The evolution of the domain pattern was mapped with soft x-ray photoemission electron microscopy and magnetic force microscopy. Micromagnetic modeling, permitting detailed analysis of the spin texture, accurately reproduces the measured domain state transformation. The simulations also helped stipulate the energy barriers associated with the creation and annihilation of the topological charges and thus to assess the stability of the domain states in this magnetic microstructure.",

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AU - Folven, Erik

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Interplay between bulk and edge-bound topological defects in a square micromagnet

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