Phys. Rev. Lett. 89, 197203 (2002) [4 pages]Abrupt Topological Transitions in the Hysteresis Curves of Ferromagnetic MetalatticesReceived 5 February 2002; published 22 October 2002 When a metal is confined to the interstices of an inert colloidal crystal, the intrinsic order parameter(s) of electronic and magnetic phenomena within the metal interact with the structural order parameter of the surrounding (and confining) colloidal crystal. If the magnetic stiffness length is comparable to the colloidal lattice constant, the interplay of competing interactions stabilizes multiple topologically distinct magnetic phases separated by sharp transitions in the hysteresis curves. The colloidal confinement also induces substantial coercivity in metals that are perfectly soft in the bulk. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.197203
DOI:
10.1103/PhysRevLett.89.197203
PACS:
75.75.+a, 75.60.-d
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