Composite topological structure of domain walls in synthetic antiferromagnets

Kolesnikov, Alexander; Плотников, В. С.; Пустовалов, Е. В.; Samardak, Alexander S.; Chebotkevich, L. A.; Ognev, A. V.; Tretiakov, Oleg A.

doi:10.1038/s41598-018-33780-6

Cited by 20 publications

(19 citation statements)

References 54 publications

(49 reference statements)

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“…Similar to the magnetic skyrmion, the magnetic bimeron is a topological spin texture in in-plane magnetized system [10,33,[46][47][48][49][50][51][52][53][54][55][56][57][58][59], which carries an integer topological charge Q and can be regarded as a topological counterpart of skyrmions. An isolated bimeron with Q = 1 consists of a pair of merons with Q = 1/2, however, merons are unstable solutions so that they exist in magnetic systems in the form of pairs [47][48][49][50][51][52][53][54][55][56][57][58][59]. Note that the concept of meron was originated in classical field theory [60], and has been studied in different fields, such as quantum Hall systems [61,62].…”

Section: Introductionmentioning

confidence: 99%

Static and dynamic properties of bimerons in a frustrated ferromagnetic monolayer

et al. 2020

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Magnetic bimeron is a topological counterpart of skyrmions in in-plane magnets, which can be used as spintronic information carrier. We report the static properties of bimerons with different topological structures in a frustrated ferromagnetic monolayer, where the bimeron structure is characterized by the vorticity Qv and helicity η. It is found that the bimeron energy increases with Qv, and the energy of an isolated bimeron with Qv = ±1 depends on η. We also report the dynamics of frustrated bimerons driven by the spin-orbit torques, which depend on the strength of the damping-like and field-like torques. We find that the isolated bimeron with Qv = ±1 can be driven into linear or elliptical motion when the spin polarization is perpendicular to the easy axis. We numerically reveal the damping dependence of the bimeron Hall angle driven by the damping-like torque. Besides, the isolated bimeron with Qv = ±1 can be driven into rotation by the damping-like torque when the spin polarization is parallel to the easy axis. The rotation frequency is proportional to the driving current density. In addition, we numerically demonstrate the possibility of creating a bimeron state with a higher or lower topological charge by the current-driven collision and merging of bimeron states with different Qv. Our results could be useful for understanding the bimeron physics in frustrated magnets.

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Section: Introductionmentioning

confidence: 99%

Static and dynamic properties of bimerons in a frustrated ferromagnetic monolayer

et al. 2020

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“…These spin textures are topologicallyprotected, and can be effectively manipulated by spin currents 8,9 or electric field 10,11 , thus may serve as an ideal information carriers. In recent years, the in-plane analog of a magnetic skyrmion, named a magnetic bimeron, is gaining a lot of attention [12][13][14][15][16][17][18][19][20][21][22][23] . The topologically nontrivial square meron lattice has been experimentally observed in the chiral magnet Co 8 Zn 9 Mn 3…”

Section: Introductionmentioning

confidence: 99%

Bimeron clusters in chiral antiferromagnets

Shen

Bai

et al. 2020

npj Comput Mater

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A magnetic bimeron is an in-plane topological counterpart of a magnetic skyrmion. Despite the topological equivalence, their statics and dynamics could be distinct, making them attractive from the perspectives of both physics and spintronic applications. In this work, we demonstrate the stabilization of bimeron solitons and clusters in the antiferromagnetic (AFM) thin film with interfacial Dzyaloshinskii–Moriya interaction (DMI). Bimerons demonstrate high current-driven mobility as generic AFM solitons, while featuring anisotropic and relativistic dynamics excited by currents with in-plane and out-of-plane polarizations, respectively. Moreover, these spin textures can absorb other bimeron solitons or clusters along the translational direction to acquire a wide range of Néel topological numbers. The clustering involves the rearrangement of topological structures, and gives rise to remarkable changes in static and dynamical properties. The merits of AFM bimeron clusters reveal a potential path to unify multibit data creation, transmission, storage, and even topology-based computation within the same material system, and may stimulate spintronic devices enabling innovative paradigms of data manipulations.

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“…The existence of magnetic skyrmions has been experimentally found in many systems with bulk or interfacial Dzyaloshinskii-Moriya interaction (DMI) [2][3][4][5]. In addition, various topological structures, such as antiferromagnetic (AFM) skyrmion [11,12], ferrimagnetic skyrmion [13], antiskyrmion [14], biskyrmion [15], bobber [16], and bimeron [8,[17][18][19][20][21][22][23][24][25][26][27][28][29], are also current hot topics. In particular, a bimeron consists of two merons, which can be found in easy-plane magnets [8,18,20,28], frustrated magnets [21], and magnets with anisotropic DMI [26].…”

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Current-Induced Dynamics and Chaos of Antiferromagnetic Bimerons

et al. 2020

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Magnetic bimeron is a topologically non-trivial spin texture carrying an integer topological charge, which can be regarded as the counterpart of skyrmion in easy-plane magnets. The controllable creation and manipulation of bimerons are crucial for practical applications based on topological spin textures. Here, we analytically and numerically study the dynamics of an antiferromagnetic bimeron driven by a spin current. Numerical simulations demonstrate that the spin current can create an isolated bimeron in the antiferromagnetic thin film via the damping-like spin torque. The spin current can also effectively drive the antiferromagnetic bimeron without a transverse drift. The steady motion of an antiferromagnetic bimeron is analytically derived and is in good agreement with the simulation results. Also, we find that the alternating-current-induced motion of the antiferromagnetic bimeron can be described by the Duffing equation due to the presence of the nonlinear boundary-induced force. The associated with it chaotic behavior of the bimeron is analyzed in terms of the Lyapunov exponents. Our results demonstrate the inertial dynamics of an antiferromagnetic bimeron, and may provide useful guidelines for building future bimeron-based spintronic devices. arXiv:1905.09007v1 [cond-mat.mes-hall]

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Composite topological structure of domain walls in synthetic antiferromagnets

Cited by 20 publications

References 54 publications

Static and dynamic properties of bimerons in a frustrated ferromagnetic monolayer

Static and dynamic properties of bimerons in a frustrated ferromagnetic monolayer

Bimeron clusters in chiral antiferromagnets

Current-Induced Dynamics and Chaos of Antiferromagnetic Bimerons

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