Steering of magnetic domain walls by single ultrashort laser pulses

Shokr, Yasser A.; Sandig, Oliver; Erkovan, Mustafa; Zhang, Bin; Bernien, Matthias; Ünal, A. A.; Kronast, Florian; Parlak, Umut; Vogel, Jan; Kuch, W.

doi:10.1103/physrevb.99.214404

Cited by 21 publications

(28 citation statements)

References 52 publications

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“…Surprising effects were found for ferrimagnets. 21,22 While below the Walker breakdown where the wall leaves its easy plane and starts precessing slowing down the DW motion, 14 the temperature gradient always pulls the domain wall toward the hotter region above the Walker breakdown, and the ferrimagnetic DW can show the opposite, counterintuitive behavior of moving toward the cold end. In this case, the motion to either the hotter or the colder ends is driven by angular momentum transfer and, therefore, strongly affected by the angular momentum compensation temperature, a unique property of ferrimagnets.…”

Section: Introductionmentioning

confidence: 99%

Domain walls in antiferromagnets: The effect of Dzyaloshinskii–Moriya interactions

Conzelmann

Selzer

Nowak

2020

Journal of Applied Physics

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Section: Introductionmentioning

confidence: 99%

Domain walls in antiferromagnets: The effect of Dzyaloshinskii–Moriya interactions

Conzelmann

Selzer

Nowak

2020

Journal of Applied Physics

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“…Finally, we want to mention that first experimental evidence on copropagation of a DW with a thermal magnon current, induced by ultrashort laser pulses, has been reported recently by Shokr et al [6]. In their work it is reported that DWs in a ferrimagnetic GdFeCo alloy will move away from the laser spot center, i.e.…”

Section: Discussionmentioning

confidence: 84%

“…Similar models have been already used in the literature to model the spin dynamics of ferrimagnetic systems, the most prominent example being GdFeCo alloys used for ultrafast toggle switching [13][14][15][16][18][19][20] and HD-AOS [25,29,30]. Despite their potential key role on such a switching process, the study of DW motion under thermal gradients of such kind of materials [6] has gained far less attention.…”

Section: A Atomistic Spin Modelmentioning

confidence: 99%

“…Prominent examples include the fields of spin caloritronics [3,4], e.g. domain wall (DW) motion by temperature gradients [5][6][7][8][9][10][11][12], and the field of ultrafast spin dynamics, e.g. thermallyinduced magnetic toggle-switching by ultrafast heat load in ferrimagnets (FIs) [13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…the properties of thermal magnon currents strongly depend on the underlying microscopic spin structure [52,53]. Thus, DW motion in FI driven by temperature gradients has been scarcely investigated so far [6] and previous works on DW motion in FIs (and synthetic AFMs) were focused on more controllable stimuli, such as electric currents [51,54] and magnetic fields [49].…”

Section: Introductionmentioning

confidence: 99%

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Unveiling domain wall dynamics of ferrimagnets in thermal magnon currents: Competition of angular momentum transfer and entropic torque

Donges

Grimm

Jakobs

et al. 2020

Phys. Rev. Research

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Control of magnetic domain wall motion holds promise for efficient manipulation and transfer of magnetically stored information. Thermal magnon currents, generated by temperature gradients, can be used to move magnetic textures, from domain walls, to magnetic vortices and skyrmions. In the last years, theoretical studies have centered in ferro-and antiferromagnetic spin structures, where domain walls always move towards the hotter end of the thermal gradient. Here we perform numerical studies using atomistic spin dynamics simulations and complementary analytical calculations to derive an equation of motion for the domain wall velocity. We demonstrate that in ferrimagnets, domain wall motion under thermal magnon currents shows a much richer dynamics. Below the Walker breakdown, we find that the temperature gradient always pulls the domain wall towards the hot end by minimizating its free energy, in agreement with the observations for ferro-and antiferromagnets in the same regime. Above Walker breakdown, the ferrimagnetic domain wall can show the opposite, counterintuitive behavior of moving towards the cold end. We show that in this case, the motion to the hotter or the colder ends is driven by angular momentum transfer and therefore strongly related to the angular momentum compensation temperature, a unique property of ferrimagnets where the intrinsic angular momentum of the ferrimagnet is zero while the sublattice angular momentum remains finite. In particular, we find that below the compensation temperature the wall moves towards the cold end, whereas above it, towards the hot end. Moreover, we find that for ferrimagnets, there is a torque compensation temperature at which the domain wall dynamics shows similar characteristics to antiferromagnets, that is, quasi-inertia-free motion and the absence of Walker breakdown. This finding opens the door for fast control of magnetic domains as given by the antiferromagnetic character while conserving the advantage of ferromagnets in terms of measuring and control by conventional means such as magnetic fields. arXiv:1911.05393v1 [cond-mat.mtrl-sci]

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Bulk and Interfacial Effects in the Co/NixMn100−x Exchange‐Bias System due to Creation of Defects by Ar+ Sputtering

Shinwari

Gelen

Shokr

et al. 2021

Physica Rapid Research Ltrs

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Research on ultrathin magnetic layers and layered materials has reached an enormous impact, both scientifically and economically, with respect to applications in magnetic data storage technology, as sensors, or for future electronics utilizing the spin rather than the charge of electrons, the so-called "spintronics". [1][2][3][4] The physical size of a bit of information in magnetic data storage is already in the nanometer regime and is still shrinking, following the everincreasing demand for higher recording densities. Very soon the dimension of the recording bit will reach the sub-10 nm range. This poses formidable challenges to the read sensors. One ingredient of hard disk read sensors are magnetic layered systems in which ferromagnetic (FM) and antiferromagnetic (AFM) materials are in contact. [5] They show the exchange bias (EB) effect, which has received increased attention during the past decades. [6][7][8][9][10][11] It manifests itself in a shift of the magnetic hysteresis loop of the FM layer along the field axis. [12] Although reported first in 1956, [13] it was only in the mid-1990s that it shifted into the center of interest, triggered by applications of FM/AFM heterostructures for tailoring the magnetic properties of magnetoresistive devices. The past years have seen significant advances toward an explanation of the effect, however, a fundamental microscopic picture of the origin of the unidirectional magnetic anisotropy present in the EB effect is still missing.The occurrence of EB requires two basic ingredients: a magnetic interaction between FM and AFM spins at the interface, and a pinning of magnetic moments against the reversal of the FM-layer magnetization by the external magnetic field inside the AFM layer. As in AFM materials the direction of the spins varies on the length scale of single atomic distances, a thorough characterization of the atomic structure of the films and their interface is mandatory for fundamental investigations into the effect. In the commonly used polycrystalline systems prepared by sputtering techniques this is naturally not the case. A promising approach is the investigation of single-crystalline systems. [14][15][16][17][18][19] In such systems, it is shown, for example, that the magnetic coupling between AFM and FM layers is due to

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Steering of magnetic domain walls by single ultrashort laser pulses

Cited by 21 publications

References 52 publications

Domain walls in antiferromagnets: The effect of Dzyaloshinskii–Moriya interactions

Domain walls in antiferromagnets: The effect of Dzyaloshinskii–Moriya interactions

Unveiling domain wall dynamics of ferrimagnets in thermal magnon currents: Competition of angular momentum transfer and entropic torque

Bulk and Interfacial Effects in the Co/NixMn100−x Exchange‐Bias System due to Creation of Defects by Ar+ Sputtering

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