Relaxation of Labyrinth Domain Structure    of Ferromagnetic Thin Film under Field Cycles

Miura, Seiichiro; Mino, Michinobu; Yamazaki, Hitoshi

doi:10.1143/jpsj.70.2821

Cited by 13 publications

(13 citation statements)

References 10 publications

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“…For example, in self-organizing processes of frustrated systems undergoing phase separation, the stripe patterning is often with parallel but meandering lamellae, due to the topological defects generated by the frustrated nature of the interactions of the systems. 1 In fact, such a labyrinth glassy state is well known in many systems such as diblock copolymers, 6,14 magnetic films, [15][16][17] and self-generated glasses. 5 External fields, temperature, and patterned substrates are often ways to straighten lamellae by removing the topological defects.…”

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confidence: 99%

Self-organizing stripe patterns in two-dimensional frustrated systems with competing interactions

2003

Phys. Rev. B

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The formation of self-organizing stripe structures in a two-dimensional frustrated system with competing short-range attractive and long-range Coulomb repulsive interactions is investigated by continuous time Monte Carlo simulation technique. We find that intermediate between the frustrated meandering striped phase at low temperatures and the disordered phase at high temperatures is a highly oriented stripe phase where frustrationinduced topological defects are effectively alleviated. The stability and the orientational ordering of stripe structures are mainly controlled by the temperature T, while the stripe thickness is determined by the strength of long-range repulsions g. A metastable branching stripe phase may appear between two ordered striped phases which are different in the width of the stripes. Furthermore, we obtain a complete T-g phase diagram describing the striped phase transitions. Our results clearly indicate a possibility for the production of highly ordered and defect-free nanometer-scale materials with different sizes by tuning the temperature and the relative repulsion strengths, and provide an interesting and universal picture to account for striking and substantial physics revealed in the stripe patterns of soft materials.

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confidence: 99%

Self-organizing stripe patterns in two-dimensional frustrated systems with competing interactions

2003

Phys. Rev. B

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“…The present work was motivated by several recent experiments investigating the formation processes of magnetic domain structures and their statistical characteristics in garnet thin film under a temporally periodic external field [15,16]. It has been observed that the garnet thin film, which is one of the materials to form a ferromagnetic phase, constructs several spatial patterns, e.g., labyrinth, lamellar, triangular lattice, and spotty patterns, etc., depending on values of amplitude and frequency of the external magnetic field.…”

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confidence: 99%

Domain dynamics in the anisotropic Swift-Hohenberg equation

Ouchi

Fujisaka²

2004

Phys. Rev. E

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Two types of asymptotic ordering processes in the anisotropic Swift-Hohenberg equation are studied, paying particular attention to the interaction between domain walls. For the first type, we will discuss the time evolution in which the spatially oscillatory patterns are formed, and show that two kinds of patterns exist depending on whether or not the imaginary part of the field vanishes. When the imaginary part is present, the equation has two distinct states which are regarded as kinds of domains, so the dynamics between two domain walls is established. We then discuss, for the second type, the dynamics when nontrivial uniform states are constructed. There exist two different domain walls, the Ne el type wall and the Bloch type wall, in a similar way to the anisotropic Ginzburg-Landau equation. The equation of motion for two domain walls is derived, and it is shown that the distance between the two domain walls eventually approaches a finite length. The theoretical result is confirmed by numerical simulations. This fact proves the validity of the prediction on the temporal development of the distance between two domain walls.

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“…The alternate fields behave like thermal fluctuations. In this evolution process, defects of a domain pattern decrease with the power low as a function of number of alternate field cycles [5]. This process has a long-tail characteristic.…”

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confidence: 96%

“…With the increase of the amplitude of alternate fields, the segment clusters become small. r Domain structures in uniaxial magnetic garnet films are one of the best objects to study pattern dynamics [1][2][3][4][5][6]. Usually observed labyrinth structures contain many eddies.…”

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confidence: 99%