Finding order in disorder: Magnetic coupling distributions and competing anisotropies in an amorphous metal alloy

Finding order in disorder : Magnetic coupling distributions and competing anisotropies in an amorphous metal alloy

Thorarinsdottir, K. A. (author): Univ Iceland, Sci Inst, Dunhaga 3, IS-107 Reykjavik, Iceland.

Sigurjonsdottir, V. V. (author): Univ Iceland, Sci Inst, Dunhaga 3, IS-107 Reykjavik, Iceland.

Thorsteinsson, E. B. (author): Univ Iceland, Sci Inst, Dunhaga 3, IS-107 Reykjavik, Iceland.

Magnus, F. (author): Univ Iceland, Sci Inst, Dunhaga 3, IS-107 Reykjavik, Iceland.

Univ Iceland, Sci Inst, Dunhaga 3, IS-107 Reykjavik, Iceland Materialfysik (creator_code:org_t)

American Institute of Physics (AIP), 2022
2022
English.
In: APL Materials. - : American Institute of Physics (AIP). - 2166-532X. ; 10:4

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Abstract Subject headings

Amorphous metals have unusual magnetic properties that arise due to the disordered atomic arrangement. We show that Co-x(Al70Zr30)(100-x) (65 < x < 92 at.%) amorphous alloys have a distribution in the local magnetic coupling and ordering temperature, which can be explained by nanoscale composition variations. We use competing anisotropies induced by the substrate and an applied field during growth to probe the Co concentration distribution. Only regions with high enough Co concentration develop a magnetic anisotropy along the magnetic field during growth, whereas regions of low Co concentration have an anisotropy dictated by the substrate. A Gaussian distribution in the Co concentration of width 5.1 at.% is obtained from the variation in anisotropy. The results demonstrate the importance of composition variations for emergent magnetic properties and have far reaching implications for the properties of disordered materials in general.

By the author/editor: Thorarinsdottir, ...; Strandqvist, Nan ...; Sigurjonsdottir, ...; Thorsteinsson, E ...; Hjörvarsson, Bjö ...; Magnus, F.

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Other Materials ...

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