Direct visualization of dipolar ferromagnetic domain structures in Co nanoparticle monolayers by electron holography

Kazuo Yamamoto; Sara A. Majetich; Martha McCartney; Madhur Sachan; Saeki Yamamuro; Tsukasa Hirayama

doi:10.1063/1.2973675

Direct visualization of dipolar ferromagnetic domain structures in Co nanoparticle monolayers by electron holography

Kazuo Yamamoto, Sara A. Majetich, Martha McCartney, Madhur Sachan, Saeki Yamamuro, Tsukasa Hirayama

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

45 Scopus citations

Abstract

Electron holography has revealed dipolar ferromagnetic domain structures in ordered monolayer arrays of Co nanoparticles. In zero-field-cooling experiments, we demonstrate the formation of micron-sized magnetically ordered regions with transverse domain walls, and a spatially varying moment order parameter. Truncated vortex structures that can be modified by an applied field are observed near the sample edges. The collectively magnetized state shows soft magnetic properties and long-range order that is stable over times over 1 h at 108 K.

Original language	English (US)
Article number	082502
Journal	Applied Physics Letters
Volume	93
Issue number	8
DOIs	https://doi.org/10.1063/1.2973675
State	Published - 2008

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.2973675

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abstract = "Electron holography has revealed dipolar ferromagnetic domain structures in ordered monolayer arrays of Co nanoparticles. In zero-field-cooling experiments, we demonstrate the formation of micron-sized magnetically ordered regions with transverse domain walls, and a spatially varying moment order parameter. Truncated vortex structures that can be modified by an applied field are observed near the sample edges. The collectively magnetized state shows soft magnetic properties and long-range order that is stable over times over 1 h at 108 K.",

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AU - Yamamoto, Kazuo

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AU - McCartney, Martha

AU - Sachan, Madhur

AU - Yamamuro, Saeki

AU - Hirayama, Tsukasa

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AB - Electron holography has revealed dipolar ferromagnetic domain structures in ordered monolayer arrays of Co nanoparticles. In zero-field-cooling experiments, we demonstrate the formation of micron-sized magnetically ordered regions with transverse domain walls, and a spatially varying moment order parameter. Truncated vortex structures that can be modified by an applied field are observed near the sample edges. The collectively magnetized state shows soft magnetic properties and long-range order that is stable over times over 1 h at 108 K.

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