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Anomalous temperature-dependent exchange bias in Fe films deposited on Si substrates with the native oxide layer
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10.1063/1.2917087
/content/aip/journal/jap/103/9/10.1063/1.2917087
http://aip.metastore.ingenta.com/content/aip/journal/jap/103/9/10.1063/1.2917087
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Magnetic hysteresis loops of the 10-nm-thick Fe film measured at various temperatures from 2 to 300 K. The sample was initially cooled in a positive 20 kOe field down to 2 K. Hysteresis loops were obtained on increasing temperature. At , the loop shift is opposite to the field cooling direction indicating a negative exchange bias. On the contrary, at , the loop shift has switched to the same direction as the cooling field indicating a positive exchange bias.

Image of FIG. 2.
FIG. 2.

Exchange-bias loop shift (a) and coercivity (b) as a function of temperature for the 10-nm-thick Fe film. Sample was initially cooled in a positive 20 kOe field down to 2 K. Hysteresis loops were obtained on increasing temperature. The solid lines are guides to the eye.

Image of FIG. 3.
FIG. 3.

The exchange-bias field vs the inverse of the Fe thickness . The hysteresis loops were measured at 2 K after 20 kOe field cooling from room temperature.

Image of FIG. 4.
FIG. 4.

Schematic illustration of the spin configuration at (a) and (b) in our simple model. is the surface-spin-glass transition temperature. is the Fe layer spins, whereas and are the surface and interior spins for Fe oxide nanoparticles at the interface (see text).

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/content/aip/journal/jap/103/9/10.1063/1.2917087
2008-05-09
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Anomalous temperature-dependent exchange bias in Fe films deposited on Si substrates with the native oxide layer
http://aip.metastore.ingenta.com/content/aip/journal/jap/103/9/10.1063/1.2917087
10.1063/1.2917087
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