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Identification of unidirectional anisotropy in exchange-biased bilayers using ferromagnetic resonance
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10.1063/1.2190767
/content/aip/journal/apl/88/14/10.1063/1.2190767
http://aip.metastore.ingenta.com/content/aip/journal/apl/88/14/10.1063/1.2190767
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) (a) Hysteresis loops of for different thicknesses of ferromagnetic GaMnAs layers. (b) Dependence of coercivity and exchange bias fields on . The solid lines are curves fitted to experimental data to allow comparison of our results with the widely reported dependence of and in metallic AFM/FM systems. The fitted exponents equal for (thick line) and for (thin line).

Image of FIG. 2.
FIG. 2.

(Color online) FMR spectra for the sample with a thick GaMnAs layer, obtained in (a) ZFC and (b) FC experiments, for two opposite orientations of magnetic field. (c) Dependence of unidirectional anisotropy field on . The solid line was fitted from the same equation as that used in Fig. 1(b), with giving the best fit. (d) Anisotropy exchange energies and obtained from the hysteresis loop and the FMR data, respectively.

Image of FIG. 3.
FIG. 3.

(Color online) (a) Temperature dependence of FMR positions for two opposite directions of magnetic field, obtained after initial FC (black) and after subsequent ZFC to (red). The lines joining the points are guides for the eyes. Both sets of data were interpolated numerically for the same values of in order to allow for possible temperature drift. (b) Unidirectional anisotropy field , calculated from data. Note that after first temperature scan up to the sample was again zero field cooled, and the experiment repeated, showing a very similar behavior (marked “second heating”).

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/content/aip/journal/apl/88/14/10.1063/1.2190767
2006-04-07
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Identification of unidirectional anisotropy in exchange-biased MnO∕GaMnAs bilayers using ferromagnetic resonance
http://aip.metastore.ingenta.com/content/aip/journal/apl/88/14/10.1063/1.2190767
10.1063/1.2190767
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