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Hydrogen adsorption promoted perpendicular magnetic anisotropy in nano-structured Fe coverage on Pd/W{112} faceting surface
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10.1063/1.4811492
/content/aip/journal/apl/102/24/10.1063/1.4811492
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/24/10.1063/1.4811492
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Figures

Image of FIG. 1.
FIG. 1.

(a) LEED patterns of 2 PML Fe deposited on Pd/W{112} after annealing at the indicated temperatures. All of the LEED patterns were taken with a beam energy = 110 eV, while the sample temperature was 105 K. (b) Temperature programmed Auger signals of Fe, Pd, and W as functions of annealing temperature for two samples of 1.7 PML and 2.6 PML Fe on Pd/W{112}. The heating rate is 4 K/s.

Image of FIG. 2.
FIG. 2.

Perpendicular coercivity of 1.9 PML Fe grown on Pd/W{112} as a function of time when exposed to (1) the H gas pressure of 2 × 10 Torr (red circle), (2) the UHV base pressure of 2 × 10 Torr (blue square), and (3) the CO gas pressure of 2 × 10 Torr (green triangle). The inset shows the hysteresis loops measured under the UHV base pressure of 2 × 10 Torr after waiting for 15, 30, 45, and 75 min.

Image of FIG. 3.
FIG. 3.

(a) Coercivity plotted as a function of Fe thickness for Fe deposited on Pd/W{112} at 105 K before H exposure. Spin reorientation transition (from perpendicular to in-plane) occurred at ∼2.0 PML Fe and all of these samples revealed small coercivity (less than 50 Oe). (b) After exposure to H gas pressure of 2 × 10 Torr for half hour, the critical thickness of SRT shifts to ∼2.8 PML Fe and the magnitude of coercivity is significantly enhanced.

Image of FIG. 4.
FIG. 4.

Hydrogen saturated 2.5 PML Fe on Pd/W{112} underwent temperature cycling MOKE measurement in (a) UHV base pressure of 2 × 10 Torr and (b) 2 × 10 Torr H gas pressure. Inset: Thermal desorption of H as a function of temperature. The maximum desorption rate occurred at 300 K.

Image of FIG. 5.
FIG. 5.

Upper panel: The LEED patterns of ∼1 PML Pd/W(111) with no annealing (no facet: planar surface), 800 K annealing, and 1000 K annealing, respectively. Lower panel: The perpendicular coercivity of 1.9 PML Fe deposited on the above surfaces, as functions of 2 × 10 Torr exposure time.

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/content/aip/journal/apl/102/24/10.1063/1.4811492
2013-06-17
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Hydrogen adsorption promoted perpendicular magnetic anisotropy in nano-structured Fe coverage on Pd/W{112} faceting surface
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/24/10.1063/1.4811492
10.1063/1.4811492
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