Domain wall motion by localized temperature gradients

Moretti, Simone; Raposo, V.; Martínez, Eduardo; López-Dı́az, L.

doi:10.1103/physrevb.95.064419

Cited by 41 publications

(50 citation statements)

References 36 publications

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“…To evidence the above absorption mechanism that explains the net displacement of DW, we for the first time measure the absorption of SW in the region containing DW within frequency range [11][12][13][14][15][16][17][18][19][20][21][22][23][24] GHz which includes three resonant peaks (see the red dot line in figure 12). In comparison with the averaged velocity of DW (normalized by the power of arrived SW to the left boundary of DW) (see blue dot line), it indeed demonstrates well agreement.…”

Section: Inset)mentioning

confidence: 99%

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Quantifying arbitrary-spin-wave-driven domain wall motion, the creep nature of domain wall and the mechanism for domain wall advances

Gao

Weng

et al. 2019

New J. Phys.

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Domain wall motion (DWM) by spin waves (SWs) in different waveforms in a magnetic nanostripe is investigated via micromagnetic simulations. Diversified DWMs are observed. It is found that SW harmonic drives DWM most efficiently and irregular SW may cause abnormal excitation spectrum for DWM in the low-frequency range. We prove that SW harmonic is the basic element when interacting with DW and causes simple creeping motion of DW (i.e. forward propagation of DW accompanied with oscillation) with the same frequency as applied SW harmonic. Under irregular/polychromatic SW, DW makes responses to the energies carried by constituent SW harmonics, instead of overall exhibited torques, and simultaneously conducts multiple creeping motions. This finding enables the analysis for the induced DWM under arbitrary SW. Mapping of SW inside DW reveals that the simple creeping motion is due to real-space expansion and contraction inside DW and the monolithic translation of DW. It is further elucidated that the former relates to the transmitting of spin torques of SW through DW and the latter corresponds to the absorption of spin torques by DW. The overall absorbed spin torques point to direction same as SW propagation and drive DW forward. In addition, the absorption mechanism is evidenced by the well agreement between absorption of SW and averaged velocity of DW. various magnetic structures. In addition, the ability to assist other approaches for improved performance in DWM gives it an extra advantage [50,51].On the other hand, the interplay between SW and DW remains interesting in fundamental physics. Although great effort has been made in understanding the basic characteristics of SW-induced DWM in terms of both theoretical analysis [34,35,[37][38][39]41] and micromagnetic simulations [32-36, 40, 42], the precise picture in dynamics was never determined. So far, two major mechanisms were proposed: magnonic spin-transfer torque (STT) [34] and magnonic linear momentum transfer torque (LMTT) [11,35]. In STT (for a simplified 1D model), linearization on Landau-Lifshitz-Gilbert (LLG) equation gives a solution of reflectionless propagating SW described by a Schrodinger equation. The obtained SW carries a constant magnon current transmitting through DW. Magnons can be viewed as spin-1 bosons with angular momentum ±ÿ and linear momentum ÿk. As a magnon passes through the DW, its spin is changed by 2ÿ; according to the conservation of angular momentum, the spin of 2ÿ must be transferred to DW, which further results in the backward motion of DW with respect to SW propagation [34,41]. On the other hand, what concerns the LMTT theory is the conservation law for linear momentum. LMTT was proposed to explain cases with reflection. Reflected magnon reverses its wave vector k in sign. That is, the linear momentum is changed by 2ÿk. The transfer of linear momentum to DW rewrites the effective field in LLG and causes forward motion of DW [35,42]. STT and LMTT can only be partially correct due to the fact that SW transmission varies with frequenc...

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Section: Inset)mentioning

confidence: 99%

“…For these reasons, new possibilities are still being explored. Recent progress includes making use of voltage [21], temperature gradient [22][23][24][25][26][27][28], mechanical stress [29,30], laser pulses [31], spin waves (SWs) [32][33][34][35][36][37][38][39][40][41][42], etc.…”

Section: Introductionmentioning

confidence: 99%

Quantifying arbitrary-spin-wave-driven domain wall motion, the creep nature of domain wall and the mechanism for domain wall advances

Gao

Weng

et al. 2019

New J. Phys.

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“…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%

“…In previous works the DW motion of ferromagnets (FMs) and antiferromagnets (AFMs) induced by temperature gradients has been investigated thoroughly [7][8][9][10][11]. For instance, both, experimental [5,41] and theoretical [7,8,10,12] studies on FMs, have shown that a DW in a temperature gradient moves towards the hotter end of the sample. On a microscopic level, the hot sample region acts as a magnon source.…”

Section: Introductionmentioning

confidence: 99%

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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“…Fortunately, thermally driven DW motion under temperature(T ) gradient in an antiferromagnet has been demonstrated by numerical calculations on a classical spin model in earlier work. 12 On the one hand, similar to the ferromagnetic case, [21][22][23][24] Selzer et al suggested that the entropic torque (ET) induced by the T -gradient plays an essential role in the DW motion and drives the wall to the hotter regions. More interestingly, it is suggested that the domain wall is not tilted during its motion, resulting in the absence of the Walker breakdown as well as the lack of inertia in antiferromagnets, which are outstanding merits for technical applications and make antiferromagnets distinctly different from ferromagnets.…”

Section: Introductionmentioning

confidence: 99%

Brownian motion and entropic torque driven motion of domain walls in antiferromagnets

et al. 2018

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We study the spin dynamics in antiferromagnetic nanowire under an applied temperature gradient using micromagnetic simulations on a classical spin model with an uniaxial anisotropy. The entropic torque driven domain-wall motion and the Brownian motion are discussed in detail, and their competition determines the antiferromagnetic wall motion towards the hotter or colder region. Furthermore, the spin dynamics in an antiferromagnet can be well tuned by the anisotropy and the temperature gradient. Thus, this work not only reproduces the main conclusions obtained in earlier works [Kim et al., Phys. Rev. B 92, 020402(R) (2015); Selzer et al., Phys. Rev. Lett. 117, 107201 (2016)], but more importantly gives the concrete conditions under which these conclusions apply respectively. Our results may provide useful information on the antiferromagnetic spintronics for future experiments and storage device design.

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Domain wall motion by localized temperature gradients

Cited by 41 publications

References 36 publications

Quantifying arbitrary-spin-wave-driven domain wall motion, the creep nature of domain wall and the mechanism for domain wall advances

Quantifying arbitrary-spin-wave-driven domain wall motion, the creep nature of domain wall and the mechanism for domain wall advances

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

Brownian motion and entropic torque driven motion of domain walls in antiferromagnets

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