A study of the stripe domain phase at the spin reorientation transition of two-dimensional magnetic system

Kwon, Hee Young; Hong, S.S.; Seok, Joo-Myoung; Bu, K.M.; Wu, Y. Z.; Qiu, Z. Q.; Won, C.

doi:10.1016/j.jmmm.2010.04.019

Cited by 18 publications

(26 citation statements)

References 21 publications

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“…Here we present a domain spacing model for stripe domain patterns in two-dimensional (2D) ultrathin films, which in contrast to previous approaches also includes the in-plane magnetostatic energy of the domain walls and therefore correctly describes the transition from Bloch to Néel walls in the case of weak DMI. The model considerably extends the work of Kashuba and Pokrovsky [29] as well as similar studies of Won et al [30][31][32]. Experimental data obtained by threshold photoemission magnetic circular dichroism photoemission electron microscopy (TP-MCD-PEEM) on Ni/Fe bi-and trilayer samples grown epitaxially on Cu(001) are successfully recovered by the model.…”

Section: Introductionsupporting

confidence: 79%

“…Here we introduce the 2D DMI constant D = Dt = 2D at a , with D being the DMI constant per volume, t being the sample thickness, and D at being the DMI per atomic bond for a fcc lattice with lattice constant a. The ground state of the stripe domain pattern in a thin ferromagnetic film is found by minimizing its total energy per area comprising exchange, anisotropy, DMI, and dipole energy [29][30][31][32]35].…”

Section: Introductionmentioning

confidence: 99%

“…Kashuba and Pokrovsky derived a domain spacing model in the 2D limit excluding DMI which predicts an exponential dependence of the stripe domain width on the exchange constant, the effective perpendicular anisotropy K 2,eff , and the square of the saturation magnetic moment per area M S [29,35]. Won et al pointed out that depending on the effective perpendicular anisotropy, the stripe domain phase in ultrathin perpendicularly magnetized films has to be divided into two regimes: the normal stripe phase for sufficiently large effective anisotropy and the spin helix/cycloid phase for very small anisotropy in the vicinity of the spin-reorientation transition (SRT) from OOP to in-plane (IP) magnetization [30,32]. The reason for the existence of the spin helix/cycloid phase is that with decreasing anisotropy the domain walls grow, whereas the stripe domain width decreases, so that neighboring domain walls merge, finally leading to a sinusoidal shape of the domains.…”

Section: Introductionmentioning

confidence: 99%

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Domain-width model for perpendicularly magnetized systems with Dzyaloshinskii-Moriya interaction

2017

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The influence of the Dzyaloshinskii-Moriya interaction (DMI) on stripe domains in perpendicularly magnetized thin ferromagnetic films is theoretically and experimentally investigated. We develop a domain spacing model describing the dependence of the stripe domain width on the magnetic properties of the sample. By including the magnetostatic energy of the domain walls the model correctly describes the transition from Bloch to Néel walls with increasing DMI constant. An approach to determine the magnitude of the DMI constant by fitting the stripe domain width as a function of the effective perpendicular anisotropy of wedge-shaped samples is developed and applied to several ultrathin multilayer samples based on Ni/Fe/Cu(001). The magnitude of the DMI constant arising from Fe/Ni and Ni/Fe interfaces is 0.3 ± 0.14 meV/atom, indicating that the domain walls are in a pure chiral Néel state. Furthermore, phase diagrams of the skyrmionic bubble domain phase are recorded for two samples with different DMI constants, and by scaling the magnetic field a universal phase diagram for perpendicularly magnetized systems is obtained.

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Section: Introductionsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Domain-width model for perpendicularly magnetized systems with Dzyaloshinskii-Moriya interaction

2017

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“…To test this model and clarify the role of K u in a DMI system, we performed Monte Carlo simulations 32,33 . A two-dimensional Heisenberg model was constructed to simulate DW configurations in the presence of the interfacial DMI and K u (see Supplementary Note 1).…”

Section: Resultsmentioning

confidence: 99%

Unlocking Bloch-type chirality in ultrathin magnets through uniaxial strain

et al. 2015

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Chiral magnetic domain walls are of great interest because lifting the energetic degeneracy of left-and right-handed spin textures in magnetic domain walls enables fast current-driven domain wall propagation. Although two types of magnetic domain walls are known to exist in magnetic thin films, Bloch-and Néel-walls, up to now the stabilization of homochirality was restricted to Néel-type domain walls. Since the driving mechanism of thin-film magnetic chirality, the interfacial Dzyaloshinskii-Moriya interaction, is thought to vanish in Bloch-type walls, homochiral Bloch walls have remained elusive. Here we use real-space imaging of the spin texture in iron/nickel bilayers on tungsten to show that chiral domain walls of mixed Bloch-type and Néel-type can indeed be stabilized by adding uniaxial strain in the presence of interfacial Dzyaloshinskii-Moriya interaction. Our findings introduce Bloch-type chirality as a new spin texture, which may open up new opportunities to design spin-orbitronics devices.

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“…What is more, these twodimensional magnetic systems may exhibit a spin reorientation transition (SRT) where the magnetization vector M rotates from out-of-plane into the plane of the film. When approaching the SRT from the perpendicularly magnetized region of the magnetic film, the domain width becomes narrower and finally assumes a minimum value-independent of the geometrical shape of the domain pattern-before M finally rotates into the plane 6 . In essence, in thermal equilibrium, the domain width in the phase with perpendicular magnetization adapts to minimize the free energy, which is dominated by exchange, anisotropy and dipolar energy, which are, in turn, functions of temperature and film thickness.…”

mentioning

confidence: 99%

Dipolar-energy-activated magnetic domain pattern transformation driven by thermal fluctuations

et al. 2013

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Two-dimensional ferromagnetic layers can serve as a playground for the study of basic physical properties of various pattern forming systems by virtue of their tuneable magnetic properties. Here we use threshold photoemission magnetic circular dichroism in combination with photoemission electron microscopy to investigate ultra-thin ferromagnetic Fe/Ni/Cu(001) films in the stripe domain phase near the spin reorientation transition as a function of film thickness, temperature and effective anisotropy. Here we report a metastable domain state with domain width larger than the thermodynamically stable one as a result of a rapid reduction of the anisotropy. The transformation into the equilibrium state takes place via the propagation of a transition front, which originates from defined steps in the film thickness.

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A study of the stripe domain phase at the spin reorientation transition of two-dimensional magnetic system

Cited by 18 publications

References 21 publications

Domain-width model for perpendicularly magnetized systems with Dzyaloshinskii-Moriya interaction

Domain-width model for perpendicularly magnetized systems with Dzyaloshinskii-Moriya interaction

Unlocking Bloch-type chirality in ultrathin magnets through uniaxial strain

Dipolar-energy-activated magnetic domain pattern transformation driven by thermal fluctuations

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