Daniel J. Coady, Amanda C. Engler, et al.
ACS Macro Letters
A continuum interface model is constructed to study the low-temperature properties of domain walls in the random-field Ising model (RFIM). The width of the domain wall and its surface tension are computed by three methods: Simple energy accounting, dimensional arguments, and approximate renormalization-group calculations. All methods yield a surface tension which is positive at sufficiently low temperature for small random fields, h, provided that the dimensionality d>2. The lower critical dimension of the RFIM is thus argued to be 2. While effects due to discreteness of a lattice are argued to alter some of the continuum results quantitatively, they do not change these central conclusions. For d<2 the ferromagnetic correlation length of the RFIM behaves like h-2(2-d)-1 as h0. © 1983 The American Physical Society.
Daniel J. Coady, Amanda C. Engler, et al.
ACS Macro Letters
Arvind Kumar, Jeffrey J. Welser, et al.
MRS Spring 2000
A.B. McLean, R.H. Williams
Journal of Physics C: Solid State Physics
E. Burstein
Ferroelectrics