Ordered growth of magnetic helical structure under the Dzyaloshinskii–Moriya interaction

Bu, K.M.; Kwon, Hee Young; Kang, Sung‐Oong; Kim, H.J.; Won, C.

doi:10.1016/j.jmmm.2013.04.056

Cited by 12 publications

(8 citation statements)

References 26 publications

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“…Obviously, the coordinates should disappear after minimization of the energy, therefore we can choose them arbitrarily, e.g. using the condition (28). It is shown in [29] that the possibility of intentional choice of ideal atomic coordinates is connected with the ambiguity of transition from discrete spins to a continuous density of magnetic moments.…”

Section: Energy Of Twist and Cantingmentioning

confidence: 99%

“…Notice that because Eq. (28) contains only exchange interaction parameters, these fictitious coordinates depend only on J ij . So, hereinafter we will refer to the positions as "exchange" ones.…”

Section: Energy Of Twist and Cantingmentioning

confidence: 99%

“…As a matter of fact, the contribution of canting is taken into account, when choosing the fictitious atomic coordinates with the condition (28). The simple additive expressions (38) and (39) …”

Section: Phenomenological Constantsmentioning

confidence: 99%

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Microscopic description of twisted magnet Cu2OSeO3

Chizhikov

Дмитриенко

2015

Journal of Magnetism and Magnetic Materials

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a b s t r a c tTwisted structures of chiral cubic ferromagnets MnSi and Cu 2 OSeO 3 can be described both in the frame of the phenomenological Ginzburg-Landau theory and using the microscopical Heisenberg formalism with a chirality arising from the Dzyaloshinskii-Moriya (DM) interaction. Recent progress in quantum firstprincipal methods allows us to calculate interatomic bond parameters of the Heisenberg model, namely isotropic exchange constants J ij and DM vectors D ij , which can be used for simulations of observed magnetic textures and comparison of their calculated characteristics, such as magnetic helix sense and pitch, with an experimental data. In the present work, it is found that unaveraged microscopical details of the spin structures (local canting) have a strong impact on the global twist and can significantly change the helix propagation number. Coefficients and of the phenomenological theory and helix propagation number k /2 = are derived from interatomic parameters J ij and D ij of individual bonds for MnSi and Cu 2 OSeO 3 crystals and similar cubic magnets with almost collinear spins.

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Section: Energy Of Twist and Cantingmentioning

confidence: 99%

Section: Energy Of Twist and Cantingmentioning

confidence: 99%

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Microscopic description of twisted magnet Cu2OSeO3

Chizhikov

Дмитриенко

2015

Journal of Magnetism and Magnetic Materials

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“…On the other hand, the DMI [17][18][19] acts as an antisymmetric exchange interaction that promotes non-uniform magnetization in materials where inversion symmetry is broken due to lack of a lattice inversion center or to the presence of surfaces or interfaces. The DMI directly competes with the exchange interaction (which tends to maintain the magnetization uniform), and when strong enough encourages the formation of rotational magnetic textures of definite chirality such as chiral DWs 1,20 , skyrmions 22 , or spin helixes 23 . SOT switching has usually been interpreted in the framework of a simple macrospin model, but recent micromagnetic simulations show that the reversal process is in fact highly non-uniform 24 The Slonczewski-like torque in heavy-metal/ferromagnet bilayers is described by an effective field ̂ , where is the normalized magnetization, ̂ is film normal, and is the current density.…”

mentioning

confidence: 99%

Chiral magnetization textures stabilized by the Dzyaloshinskii-Moriya interaction during spin-orbit torque switching

et al. 2014

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We study the effect of the Dzyaloshinskii-Moriya interaction (DMI) on current-induced magnetic switching of a perpendicularly magnetized heavy-metal/ferromagnet/oxide trilayer both experimentally and through micromagnetic simulations. We report the generation of stable helical magnetization stripes for a sufficiently large DMI strength in the switching region, giving rise to intermediate states in the magnetization confirming the essential role of the DMI on switching processes. We compare the simulation and experimental results to a macrospin model, showing the need for a micromagnetic approach. The influence of the temperature on the switching is also discussed.

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“…Examples include skyrmions [5-10], domain wall motion [11-15], helical spin textures [16,17], and spin-orbit torque magnetization switching [18-20]. However, such phenomena depend on a combination of the DMI and non-chiral magnetic effects such as anisotropy [21-23], Zeeman energy [4,24,25] and dipolar interaction [26-28].…”

mentioning

confidence: 99%

Simultaneous control of the Dzyaloshinskii-Moriya interaction and magnetic anisotropy in nanomagnetic trilayers

et al. 2017

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Magneto-optical Kerr effect (MOKE) microscopy measurements of magnetic bubble domains demonstrate that Ar+ irradiation around 100 eV can tune the Dzyaloshinskii-Moriya interaction (DMI) in Pt/Co/Pt trilayers. Varying the irradiation energy and dose changes the DMI sign and magnitude separately from the magnetic anisotropy, allowing tuning of the DMI while holding the coercive field constant. This simultaneous control emphasizes the different physical origins of these effects. To accurately measure the DMI, we propose and apply a physical model for a poorly understood peak in domain wall velocity at zero in-plane field. The ability to tune the DMI with the spatial resolution of the Ar+ irradiation enables new fundamental investigations and technological applications of chiral nanomagnetics.

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Ordered growth of magnetic helical structure under the Dzyaloshinskii–Moriya interaction

Cited by 12 publications

References 26 publications

Microscopic description of twisted magnet Cu2OSeO3

Microscopic description of twisted magnet Cu2OSeO3

Chiral magnetization textures stabilized by the Dzyaloshinskii-Moriya interaction during spin-orbit torque switching

Simultaneous control of the Dzyaloshinskii-Moriya interaction and magnetic anisotropy in nanomagnetic trilayers

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