Magnetic Domain Walls in Single-Phase and Phase-Separated Double Exchange Systems

Details Magnetic Domain Walls in Single-Phase and Phase-Separated Double Exchange Systems Magnetic Domain Walls in Single-Phase and Phase-Separated Double Exchange Systems

2002-06-14

arxiv.org/abs/cond-mat/0206257v4

Phys. Rev. B, vol. 67, 064404 (2003).

Physics

Condensed Matter

Strongly Correlated Electrons

20 pages, LaTeX-Revtex, 10 PostScript figures. Minor misprints corrected

Scientific paper

10.1103/PhysRevB.67.064404

We investigate the structure of magnetic domain walls in a classical double exchange ferromagnet, evaluating domain wall energies and charges. Three different cases are studied: (i) a conventional smooth Bloch wall, (ii) an abrupt Ising-type wall, which is shown to have lower energy at small values of carrier concentration, and (iii) stripe wall, corresponding to the two ferromagnetic domains being separated by a stripe of another, antiferromagnetic, phase. General aspects of energy balance and geometry of phase-separated states are discussed in this context. It is speculated that domain walls of the latter type may be responsible for the unusual transport properties of certain manganate films.

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