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Tailoring exchange bias through chemical order in epitaxial FePt3 films
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10.1063/1.4812761
/content/aip/journal/jap/114/1/10.1063/1.4812761
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/1/10.1063/1.4812761

Figures

Image of FIG. 1.
FIG. 1.

Structural characterization: (a) Chemical order within crystalline FePt (small arrows indicate the direction of the Fe moments, Pt is drawn without arrows). (b) X-ray diffraction of cubic FePt along (001) and (002). The difference in (001) intensity determines the degree of chemical order. The dashed lines are Voigt-fits to the data. (c) ϕ-scan along (022). The 90° periodicity indicates the epitaxial growth along the cubic symmetry.

Image of FIG. 2.
FIG. 2.

High angle neutron diffraction along the direction of the 2800 Å thick FePt thin films with  = 86% (a) and  = 54% (b). Lines are Gaussian fits to the data. (c) Temperature dependence of the integrated AFM peak intensity (the line is a guide to the eye). The dashed line represents the values obtained for a FePt order-modulated multilayer.

Image of FIG. 3.
FIG. 3.

Dark-field TEM images formed with a (001) diffracted beam for the cross sections of FePt samples with different chemical order. Bright regions correspond to chemical order, while dark ones represent disordered domains. Arrows in the image for  = 86% indicate the magnetic ordering within the sample's domains.

Image of FIG. 4.
FIG. 4.

Magnetic characterization: (a) magnetic hysteresis of the three samples at 10 K after field cooling in 1 T. (b) Exchange bias, determined as a shift of the hysteresis loop from the origin along the field axis. (c) Magnetic coercivity as a function of temperature. (d) AC susceptibility measured from low to high temperatures after field cooling in 1 T. The dashed lines in (b)–(d) represent the values obtained for a FePt order-modulated multilayer.

Tables

Generic image for table
Table I.

Growth temperature (), chemical order parameter (), chemically ordered grain size (), Néel temperature , and exchange bias at 10 K of the three (2800 Å) FePt thin films (Magnetic parameter is determined further below in this manuscript).

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/content/aip/journal/jap/114/1/10.1063/1.4812761
2013-07-01
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Tailoring exchange bias through chemical order in epitaxial FePt3 films
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/1/10.1063/1.4812761
10.1063/1.4812761
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