(a) In-focus image showing as-prepared array of spin-valve elements ( and ). (b) Defocused Fresnel image of single spin-valve element in remanent state.
Reconstructed holographic phase images of spin-valve elements ( and ) showing different remanent configurations. Arrow shows initial saturation direction. Colored bar shows phase in images ranging from 0 to . (a) Flux closure. (b) Flux closure with one vortex. (c) Complex configuration.
Phase images of (a) parallel-coupled and (b) antiparallel configurations at remanent state. (c) Corresponding line profiles. White arrows show saturation direction for (a) and (b). Element and . The phase contribution from mean inner potential is removed from the line profiles.
Hysteresis loop for spin-valve element with and .
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