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Exchange reduction of the magnetization modulus in the vicinity of a Bloch point

G. E. Hodenkov

Institute of Electronic Control Machines, Moscow

Abstract: The structure of the Bloch point (BP) core (magnetization “hedgehog”) is determined with regard to the exchange-induced reduction of the length of the magnetization vector. The magnetization modulus vanishes at the center of a small sphere embracing the BP. The value of energy of such a BP in the vicinity of the Curie ferromagnetic point in the approximation of the second-order Landau phase transition is lower than the corresponding energy value calculated in the constant modulus approximation. The stability of the BP core to radial pulsations is demonstrated.

Received: 12.08.2009

 English version: Technical Physics, 2010, 55:5, 738–740

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