The Effect of Twin Microstructure on the Magnetic Properties of Alloys with CuAul Superlattice Ordering

Abstract

The special features of a microstructure of type CoPt alloys are examined. A model of a ferromagnetic crystal with twin microstructure is suggested. The distribution of the magnetization vectors in the twin crystal is obtained. The effect of twin‐oriented domain thickness and of the magnetic field on this distribution is determined. A model of the magnetic domain structure of a stack of twin plates is proposed, taking into account known magnetic domain observation results. The connection between the magnetic domain structure parameters and those of twin microstructure is considered.

Phase Transformation, Coalescence, and Twinning of Monodisperse FePt Nanocrystals

“…Crystal defects, which have been observed in the bulk and thin L1 0 -FePt film, are mainly plane defects, such as twin and antiphase domain boundary. [25][26][27][28][29][30] It has been suggested that these defects are associated with magnetic hardness of the L1 0 -FePt. [28][29][30] In the bulk L1 0 -FePt, the twin structure has been determined to be the {110} type, i.e., the twinning plane is {110}.…”

“…[28][29][30] In the bulk L1 0 -FePt, the twin structure has been determined to be the {110} type, i.e., the twinning plane is {110}. 25,28 The {111} type twin was observed in FePt film. 29,30 We have presented a detailed high-resolution microscopic study on phase transformation, coalescence, and twin microstructure of thermally annealed monodisperse 6 nm Ft 52 Pt 48 nanocrystals.…”

“…The twin structure presented above may be closely related to the size of the coalesced grains. Crystal defects, which have been observed in the bulk and thin L1 0 -FePt film, are mainly plane defects, such as twin and antiphase domain boundary. − It has been suggested that these defects are associated with magnetic hardness of the L1 0 -FePt. − In the bulk L1 0 -FePt, the twin structure has been determined to be the {110} type, i.e., the twinning plane is {110}. , The {111} type twin was observed in FePt film. , …”

Cooperative domain structures in highly anisotropic alloys with twinned microstructure

“…В [15,16] рассмотрены неелевские стенки двух типов и Доменные стенки характеризуются тем, что в центре двойниковой границы магнитный момент направлен вдоль нормали к плоскости границы. Магнитостатическая энергия, связанная с образованием такой стенки, мала, и ее вкладом в общую энергию можно пренебречь [20,35]. В этом приближении поверхностная плотность энергии неелевской стенки равна Следовательно, что оправдывает существование стенок Нееля на двойниковых границах.…”