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Changes in magnetic properties of Co/Pd multilayers induced by hydrogen absorption
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10.1063/1.4729797
/content/aip/journal/jap/111/12/10.1063/1.4729797
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/12/10.1063/1.4729797

Figures

Image of FIG. 1.
FIG. 1.

Sketch of sample used in the x-ray reflectivity model. The location of the interface roughness parameters and the layers used as fitting parameters are indicated.

Image of FIG. 2.
FIG. 2.

Specular XRR measurements for (a) [Co2.5/] and (b) [Co4.5/], with (i)  Å, (ii)  Å, (iii)  Å, and (iv)  Å. The black dots are experimental data points and the red curves are fits to the data.

Image of FIG. 3.
FIG. 3.

Scattering length density as a function of film depth derived from the XRR fit for the [Co2.5/Pd20] (black) and the [Co4.5/Pd10] (red) samples. The film-substrate interface is set at and the inset is a close-up view of .

Image of FIG. 4.
FIG. 4.

Magnetic moment measurements in 1 atm of He (dashed blue curves) and H2 (solid red curves) with the magnetic field applied perpendicular () and parallel () to the sample surface for the (a) [Co2.5/Pd20] and (b) [Co4.5/Pd10] samples.

Image of FIG. 5.
FIG. 5.

Saturation magnetization per atom in the multilayer stack as a function of t Pd for samples with (a) [Co2.5/Pd t Pd] and (b) [Co4.5/Pd t Pd] in He (open blue circles) and in H2 (filled red circles). The green circle indicates the data points for the sample that blistered from the substrate. The filled triangles are saturation magnetization per Co atom in the stack. Lines are guides to the eye. The graph is plotted on a log scale for clarity.

Image of FIG. 6.
FIG. 6.

Anisotropy energy K P as a function of t Pd for multilayers with (a) [Co2.5/Pd t Pd] and (b) [Co4.5/Pd t Pd] in He (blue open circles) and in H2 (solid red circles) calculated as in Ref. 21. The green circle indicates the data points for the sample that blistered upon H2 loading. Lines are guides to the eye.

Image of FIG. 7.
FIG. 7.

Fractional change in (a) and (b) as a function of for multilayers with [Co2.5/] (cyan open squares) and [Co4.5/] (violet filled squares). The green circles are data points for the sample that blistered upon H2 absorption. Lines are guides to the eye.

Image of FIG. 8.
FIG. 8.

Optical image of (a) blistered sample [Co2.5/Pd25] and (b) unaffected sample [Co4.5/Pd20] after H2 absorption.

Image of FIG. 9.
FIG. 9.

Change in magnetic moment with time in 1 atm pressure after pumping out and backfilling with He and H2 periodically at saturation for (a) [Co4.5/Pd25] and (b) [Co2.5/Pd25] samples. The red curve is a fit to the data using Eq. (1). The insets show the change in magnetic moment over several cycles.

Tables

Generic image for table
Table I.

Layer and interface parameters obtained from the refinement of XRR data for nominal [Co2.5/] with (i)  Å, (ii)  Å, (iii)  Å, and (iv)  Å. , , and are the thicknesses of the Co, Pd, and multilayer period determined from . and are the roughness parameters at the Co and Pd top surfaces, respectively. The scattering length densities and are the values of at the center of the Pd and Co layers.

Generic image for table
Table II.

Layer and interface parameters obtained from the refinement of XRR data for nominal [Co4.5/] with (i)  = 25 Å, (ii)  = 20 Å, (iii)  = 15 Å, and (iv)  = 10 Å. , , and are the thicknesses of the Co, Pd, and multilayer period determined from . and are the roughness parameters at the Co and Pd top surfaces, respectively. The scattering length densities and are the values of at the center of the Pd and Co layers.

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/content/aip/journal/jap/111/12/10.1063/1.4729797
2012-06-28
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Changes in magnetic properties of Co/Pd multilayers induced by hydrogen absorption
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/12/10.1063/1.4729797
10.1063/1.4729797
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