Magnetic flux reversal in laminated Ni-Fe films
Anomalously fast flux reversal has been observed in films made of Ni-Fe layers separated by SiO. The speed of reversal increases as the number of identical layers of Ni-Fe increases. For a 5-layer film, the anomalous speed is observed in films with the SiO thickness as great as 1600 Å. Reversal time...
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Veröffentlicht in: | IEEE transactions on magnetics 1966-09, Vol.2 (3), p.557-559 |
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Sprache: | eng |
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Zusammenfassung: | Anomalously fast flux reversal has been observed in films made of Ni-Fe layers separated by SiO. The speed of reversal increases as the number of identical layers of Ni-Fe increases. For a 5-layer film, the anomalous speed is observed in films with the SiO thickness as great as 1600 Å. Reversal time curves presented as a family of curves of 1/\tau = f(h_{\perp}) with h s as a parameter have two regions. The high-drive region has a lower slope in the laminated films when compared to the single-layer films. For this family of curves, a switching coefficient S_{w'} can be defined, as the inverse slope, in a manner similar to the definition of S w for 1/\tau = f(h_{s}) with h_{\perp} as a parameter. For films with from two to five layers, S w ' is constant at 1 \times 10^{-3} \mu s and is smaller by an order of magnitude for the single-layer films. A dual loop experiment is used to confirm that coherent rotation is not a dominant mechanism. It is concluded that a model must satisfy the following criteria to successfully describe flux reversal in the laminated films: It must provide rapid flux reversal for fields less than H k , an insensitivity to transverse fields either constant or pulsed, and an interaction that can survive over a wide range of SiO thicknesses. |
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ISSN: | 0018-9464 1941-0069 |
DOI: | 10.1109/TMAG.1966.1065923 |