Laser microscopy of tunneling magnetoresistance in manganite grain-boundary junctions

M. Wagenknecht; H. Eitel; T. Nachtrab; J. B. Philipp; R. Gross; R. Kleiner; D. Koelle

doi:10.1103/PhysRevLett.96.047203

Laser microscopy of tunneling magnetoresistance in manganite grain-boundary junctions

Strongly Correlated Electrons 2009-11-11 v1 Materials Science

Authors: M. Wagenknecht , H. Eitel , T. Nachtrab , J. B. Philipp , R. Gross , R. Kleiner , D. Koelle

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Abstract

Using low-temperature scanning laser microscopy we directly image electric transport in a magnetoresistive element, a manganite thin film intersected by a grain boundary (GB). Imaging at variable temperature allows reconstruction and comparison of the local resistance vs temperature for both, the manganite film and the GB. Imaging at low temperature also shows that the GB switches between different resistive states due to the formation and growth of magnetic domains along the GB. We observe different types of domain wall growth; in most cases a domain wall nucleates at one edge of the bridge and then proceeds towards the other edge.

Keywords

tunneling magnetoresistance grain boundary manganite magnetic domains laser microscopy

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@article{arxiv.cond-mat/0511662,
  title  = {Laser microscopy of tunneling magnetoresistance in manganite grain-boundary junctions},
  author = {M. Wagenknecht and H. Eitel and T. Nachtrab and J. B. Philipp and R. Gross and R. Kleiner and D. Koelle},
  journal= {arXiv preprint arXiv:cond-mat/0511662},
  year   = {2009}
}

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5 pages, 4 figures; submitted to Phys. Rev. Lett

Laser microscopy of tunneling magnetoresistance in manganite grain-boundary junctions

Abstract

Keywords

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