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- Brucas, Rimantas, 1965, et al.
(författare)
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Magnetic and transport properties of discontinuous Ni81 Fe19/Al2O3 multilayers
- 2007
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Ingår i: Journal of Magnetism and Magnetic Materials. - : Elsevier BV. - 0304-8853. ; 310:2 SUPPL. PART 3, s. 2521-2523
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Tidskriftsartikel (refereegranskat)abstract
- The structural percolation and its correlation with the magnetic and transport properties of Ni 81 Fe 19 / Al 2 O 3 multilayer films were studied by varying the thickness (t) of the Ni 81 Fe 19 (permalloy, Py) layers in the range of 10-16 Å, while keeping the Al 2 O 3 layer thickness constant at 16 Å. Low-angle X-ray reflectivity and transmission electron microscopy measurements revealed a good structural quality of the multilayers and showed the transition from continuous Py layers (t = 16 over(A, ̊)) separated by Al 2 O 3 layers to grains (t = 10 over(A, ̊)) dispersed in the insulating matrix. Magnetization measurements showed the gradual transition from ferromagnetic layers (t = 16 over(A, ̊)) to superparamagnetic clusters (t = 12 over(A, ̊)) and isolated grains (t = 10 over(A, ̊)) that successively become blocked as the temperature decreases. The temperature dependence of the current in-plane (CIP) resistance of the samples reveals a change from typical metallic (d R / d T > 0) to dielectric (d R / d T
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| 2. |
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| 3. |
- Hanson, Maj, 1939, et al.
(författare)
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Domain walls in Fe(001) bicrystals – thickness dependence and field induced transitions
- 2007
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Ingår i: Journal of Magnetism and Magnetic Materials. - : Elsevier BV. - 0304-8853. ; 310:2 SUPPL. PART 3, s. 2195 -2197
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Tidskriftsartikel (refereegranskat)abstract
- Magnetic domain walls (DW's) formed at the grain boundary (GB) of epitaxial bicrystal Fe(0 0 1) films, thickness t = 50 and 70 nm, were studied by magnetic force microscopy. The "as-grown" samples displayed DW's with different magnetic contrast profiles yielding a single peak for t = 50 nm and a double peak with a change of sign at the centre of the wall for t = 70 nm. For t=50 nm the wall is characterised as an asymmetric Bloch wall. The double peak of the 70 nm thick film transformed into a single peak characteristic for a charged wall, when a field of 30 mT was applied along the GB. At remanence this domain wall relaxed to a regular Bloch wall divided into segments of alternating signs. © 2006 Elsevier B.V. All rights reserved.
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