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Huge magnetoresistance in ultrathin films: The role of superparamagnetic clusters and domain walls
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) of LCMO films as a function of their thickness. The line corresponds to a fit to . (b) Magnetization, normalized to the weight of the sample and to the thickness of the film, of several films.

Image of FIG. 2.
FIG. 2.

Dependence of the coercive field of three samples in the thickness range with the square root of the temperature. Below about two regimes are observed. The dashed lines are the corresponding linear fits that indicate the blocking temperatures.

Image of FIG. 3.
FIG. 3.

(Color online) (a) Resistance of three films (30, 15.5, and thick) with and without applied magnetic field. (b) MR defined as in the text for the three films evidencing the enhancement of the MR around and at low temperatures of the film.

Image of FIG. 4.
FIG. 4.

(Color online) Schematic representation of the magnetic structure of the SP films at different temperatures and applied magnetic fields. The lowest part presents a zoom of the interface between two magnetic clusters.

Image of FIG. 5.
FIG. 5.

(a) MR at of different thin films and a polycrystalline pellet. The gray line is the fit of the 6.5 nm film. (b) MR at 200 and of the film. The lines are the fits as explained in the text.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Huge magnetoresistance in ultrathin La0.7Ca0.3MnO3 films: The role of superparamagnetic clusters and domain walls