Size dependence in the magnetization reversal of Fe∕Gd multilayers on self-assembled arrays of nanospheres
The size dependent magnetization reversal of Fe∕Gd multilayers on self-assembled silica nanospheres has been studied by scanning transmission x-ray microscopy. Caps on 800nm spherules show S-shaped hysteresis loops while the caps on 330 and 160nm spherules exhibit rectangular loops. This drastic cha...
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Veröffentlicht in: | Applied physics letters 2007-10, Vol.91 (17) |
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Hauptverfasser: | , , , , |
Format: | Artikel |
Sprache: | eng |
Online-Zugang: | Volltext |
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Zusammenfassung: | The size dependent magnetization reversal of Fe∕Gd multilayers on self-assembled silica nanospheres has been studied by scanning transmission x-ray microscopy. Caps on 800nm spherules show S-shaped hysteresis loops while the caps on 330 and 160nm spherules exhibit rectangular loops. This drastic change is attributed to a transition from a radial to a uniaxial magnetization distribution with decreasing diameter and results from the increasing exchange interaction between adjacent moments. Furthermore, element selective studies reveal a transition from an aligned to a twisted magnetic state with reducing size of the nanocaps. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/1.2802075 |