We find that dipolar interactions favor ferromagnetic ordering of elongated crystals of Mn12 Acetate below 0.8 K. Ordered crystals must possess domain walls. Motion of the wall corresponds to a moving front of Landau-Zener transitions between quantum spin levels. Structure and mobility of the wall are computed. The effect is robust with respect to inhomogeneous broadening and decoherence.
@article{arxiv.0805.1433,
title = {Dipolar Ordering and Quantum Dynamics of Domain Walls in Mn-12 Acetate},
author = {D. A. Garanin and E. M. Chudnovsky},
journal= {arXiv preprint arXiv:0805.1433},
year = {2009}
}
Comments
11 PR pages, 4 figures. This is the extended version