Switching of magnetization by nonlinear resonance studied in single nanoparticles

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ID: 111666
2003
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Abstract
Magnetization reversal in magnetic particles is one of the fundamental issues in magnetic data storage. Technological improvements require the understanding of dynamical magnetization reversal processes at nanosecond time scales1. New strategies are needed to overcome current limitations. For example, the problem of thermal stability of the magnetization state (superparamagnetic limit) can be pushed down to smaller particle sizes by increasing the magnetic anisotropy2. High fields are then needed to reverse the magnetization, which are difficult to achieve in current devices. Here we propose a new method to overcome this limitation. A constant applied field, well below the switching field, combined with a radio-frequency (RF) field pulse can reverse the magnetization of a nanoparticle. The efficiency of this method is demonstrated on a 20-nm-diameter cobalt particle by using the microSQUID (superconducting quantum interference device) technique3. Other applications of this method might be nucleation or depinning of domain walls.
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Authors Christophe Thirion;Wolfgang Wernsdorfer;Dominique Mailly;Christophe Thirion;Wolfgang Wernsdorfer;Dominique Mailly;
Journal Nature Materials
Year 2003
DOI
doi:10.1038/nmat946
URL
https://doi.org/10.1038/nmat946
Keywords
biomaterials nanotechnology materials science condensed matter physics general optical and electronic materials thermal stability Cobalt magnetic particles magnetic anisotropy superconducting nanoparticles magnetization data storage particle sizes reverse the magnetization dynamical magnetization

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