KRAMMERS RATE THEORY, BROKEN SYMMETRIES, AND MAGNETIZATION REVERSAL -COMMENT

In a series of papers, H. B. Braun [J. Appl. Phys. 76, 6310 (1994), an d references therein] suggested a model for magnetization reversal in an infinite cylinder, but did not include the magnetostatic energy. It is shown here that the magnetostatic energy term of this one-dimensio nal soliton solution cannot be neglected, and cannot be normalized out . This argument invalidates all the theoretical conclusions from this model about superparamagnetism in an infinite circular cylinder, and a bout the reversal modes of elongated particles. (C) 1996 American Inst itute of Physics.