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Effects of preparation conditions on the magnetocaloric properties of Gd thin films
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10.1116/1.4795817
/content/avs/journal/jvsta/31/3/10.1116/1.4795817
http://aip.metastore.ingenta.com/content/avs/journal/jvsta/31/3/10.1116/1.4795817
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Wide angle diffraction data for (a) the ungettered set and (b) the gettered set. The peaks at 33° are due to the substrate.

Image of FIG. 2.
FIG. 2.

(Color online) Ratio of the Gd (110) peak to the Gd2O3 (111) peak for the ungettered (purple, open symbols) and the gettered (green, closed symbols) films. With the exception of the films grown at room temperature, the gettered films had a larger amount of Gd present.

Image of FIG. 3.
FIG. 3.

(Color online) Low angle diffraction data for (a) the ungettered set and (b) the gettered set. Within each set, the intensity of the high frequency oscillations which are due to the Gd layer fade as Tdepo was increased. In the gettered set, the structural formation of the bcc Gd(110) phase as well as the fcc Gd(200) phase seems to cause a rougher film surface for the films deposited at 450 and 600 °C as indicated by the loss of high frequency oscillations.

Image of FIG. 4.
FIG. 4.

(Color online) Isothermal magnetization as a function of field for the gettered film deposited at 450 °C. The temperature ranged from 180 to 330 K in 10 K steps.

Image of FIG. 5.
FIG. 5.

(Color online) Magnetization at 20 kOe (M20 kOe) as a function of deposition temperature for both ungettered and gettered films at μ0 H = 2 T at 220 K. Generally, M20 kOe increased as a function of deposition temperature and was larger in the gettered set. The (top, red) horizontal line is the M20kOe of a bulk piece of Gd and the (bottom, blue) horizontal line is the M20 kOe of thin film Gd from Ref. 23 .

Image of FIG. 6.
FIG. 6.

(Color online) −ΔS vs temperature for (a) the ungettered and (b) the gettered samples for ΔH = 1 T. The −ΔS peak increased with increasing deposition temperature and shifted to higher temperatures toward the Tc of bulk Gd (293 K). In the ungettered films, Tc ranged from 284 K for Tdepo of room temperature to 290 K for Tdepo of 450 °C. In the gettered films, Tc ranged from 275 K for Tdepo of room temperature to 295 K for Tdepo of 600 °C.

Image of FIG. 7.
FIG. 7.

(Color online) (a) −ΔSmax, (b) FWHM, and (c) RCP as a function of deposition temperature for the ungettered (purple, open symbols) and the gettered (green, closed symbols) films.

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/content/avs/journal/jvsta/31/3/10.1116/1.4795817
2013-04-01
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effects of preparation conditions on the magnetocaloric properties of Gd thin films
http://aip.metastore.ingenta.com/content/avs/journal/jvsta/31/3/10.1116/1.4795817
10.1116/1.4795817
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