Topological defects, pattern evolution, and hysteresis in thin magnetic films

Abstract

PACS. 75.60.Ch -Domain walls and domain structure. PACS. 75.60.Ej -Magnetization curves, hysteresis, Barkhausen and related effects. PACS. 75.70.Ak -Magnetic properties of monolayers and thin films.Abstract. -Nature of the magnetic hysteresis for thin films is studied by the Monte-Carlo simulations. It is shown that a reconstruction of the magnetization pattern with external field occurs via the creation of vortex-antivortex pairs of a special kind at the boundaries of stripe domains. It is demonstrated that the symmetry of order parameter is of primary importance for this problem, in particular, the in-plane magnetic anisotropy is necessary for the hysteresis.c EDP Sciences

Towards the ab initio based theory of phase transformations in iron and steel

“…[88]. At the present time the role of long-range interactions in the pattern formation is well known [89,90,91] and was discussed many times for very different systems, from stripes in hightemperature superconductors [92][93][94] to stripe domains in ferromagnetic films [95][96][97].…”

Self-Induced Glassiness and Pattern Formation in Spin Systems Subject to Long-Range Interactions

“…Therefore, also the models used to describe them can be very similar. [7,12] For example, a stripe phase emerges when the Gaussian part of the free energy of soft modes has either isolated minima or a mexican-hat shape in reciprocal space. In the latter case, the pattern emerges as a result of the spontaneous breaking of the rotational symmetry.…”

“…In the latter case, the pattern emerges as a result of the spontaneous breaking of the rotational symmetry. [12] Even in the complete absence of disorder and in a certain range of the external parameters (temperature and magnetic field), the very same free-energy can give rise to a self-induced glass. [13][14][15][16][17][18][19] This result breaks down the picture that minima in reciprocal space necessarily imply a stripe order in real space.…”

О Некоторых Деталях Описания Неупорядоченной Конденсированной Системы С Помощью Теории Дефектных Состояний Ориентационного Порядка

“…Первое слагае-мое -близкодействующее взаимодействие, обусловленное непрерывностью поля Q, второе слагаемое -слабое дальнодействующее взаимодействие, которое описывает взаимодействие между дисклинационными моментами. Хорошо известно, что та-кие дальнодействующие взаимодействия, как кулоновское, или диполь-дипольное, приводят к возникновению в системе конкурирующих состояний и к ее фрустри-рованию [9], [10]. Таким образом, дисклинационная подсистема вследствие дально-действующего взаимодействия также будет геометрически фрустрированной.…”