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The magnetic structure of exchange coupled thin films
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View: Figures


Image of FIG. 1.
FIG. 1.

Representation of the unit cell of FePt and . Their magnetic ground state is represented by the white arrows. The (110) surface, which is the growth direction of our films, is indicated by gray shading.

Image of FIG. 2.
FIG. 2.

Top: Representation of the interface. Bottom: X-ray diffraction pattern of the sample. The output of the Rietveld refinement of the structure is shown as red lines.

Image of FIG. 3.
FIG. 3.

Magnetic hysteresis curves of the bilayer recorded (a) at 280 K and (b) after field cooling to 10 K. The exchange bias effect induces an increase of the coercivity and a horizontal negative shift of the loop below the Néel temperature of . (c) Temperature dependence of the coercive field and the exchange bias field . The blocking temperature is estimated at around 110 K.

Image of FIG. 4.
FIG. 4.

(a) Selected time spectra of the layer recorded at different temperatures, without external applied field. The solid lines are fits to the data. (b) Hyperfine field distribution, as extracted from the time spectra. (c) Evolution of the average hyperfine field as a function of temperature.

Image of FIG. 5.
FIG. 5.

Top: Scheme of the measurement geometry with the sample mounted perpendicular to the synchrotron plane. This allows to distinguish between AF moments aligned parallel or perpendicular to the field cooling direction. Bottom: Time spectra recorded with the field cooling applied along the two in-plane directions and with the x-ray beam correspondingly aligned along these two axes. The red lines are fits.

Image of FIG. 6.
FIG. 6.

(a) PNR curves recorded at different magnetic field along the descending branch of the hysteresis loop shown in (b). The full dots in (b) indicates the fields at which PNR curves were recorded. (c) and (d) show the nuclear scattering length profile and the Fe magnetic moment profile, as extracted from the fits, respectively.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The magnetic structure of exchange coupled FePt/FePt3 thin films