Quenching of initial ac susceptibility in single-domain Ni nanobars

Zheng Gai, X. G. Zhang, Ivan I. Kravchenko, Scott T. Retterer, J. F. Wendelken

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The ac susceptibility measurement probes the dynamic properties of a magnetic material, which is believed to consist of magnetization rotation and domain wall motion contributions. Here we report the observation of a complete quenching of the initial ac susceptibility for a single-domain Ni nanobar array, when the ac field is aligned with the long axis of the bars. The vanishing of the susceptibility in one direction is a unique nanoscale phenomena, allowing an unambiguous determination of the magnetic state of the nanostructure and a clean separation of different contributions to its dynamic properties. For example, an unambiguous determination of the temperature-dependent surface anisotropy energy is obtained when the field is applied perpendicular to the long axis, even when the size of the nanobar is still large and the surface anisotropy does not dominate the magnetic energy.

Original languageEnglish
Article number024401
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number2
DOIs
StatePublished - Jan 3 2012

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