Investigation of domain wall motion in RE-TM magnetic wire towards a current driven memory and logic

Awano, Hiroyuki

doi:10.1016/j.jmmm.2014.12.081

Cited by 33 publications

(14 citation statements)

References 24 publications

(23 reference statements)

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“…We expect that such findings are also advantageous for currentinduced DW motion in ferrimagnets. A low threshold current density, more than one order of magnitude smaller than that of ferromagnets, has already been demonstrated in ferrimagnets [32][33] . Therefore, by tuning TA, one could obtain high-speed and low power consumed spintronic devices using ferrimagnets, which could even be superior to ferromagnetic systems.…”

mentioning

confidence: 90%

“…To date, the angular momentum compensation point and its effect on the magnetisation dynamics have often been overlooked in studies of ferrimagnets. Laser-induced magnetisation switching 18,30,31 and magnetic DW motion [32][33] , which have been major research themes of ferrimagnets, have mostly been studied without identifying TA. It has been investigated in the context of magnetic resonance or magnetisation switching by current around TA 14,15,34 , but a clear identification of spin dynamics at T = TA have been remained elusive 15 .…”

Section: M mentioning

confidence: 99%

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Fast domain wall motion in the vicinity of the angular momentum compensation temperature of ferrimagnets

et al. 2017

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Antiferromagnetic spintronics is an emerging research field which aims to utilize antiferromagnets as core elements in spintronic devices 1,2 . A central motivation toward this direction is that antiferromagnetic spin dynamics is expected to be much faster than ferromagnetic counterpart because antiferromagnets have higher resonance frequencies than ferromagnets 3 . Recenttheories indeed predicted faster dynamics of antiferromagnetic domain walls (DWs) than ferromagnetic DWs 4-6 . However, experimental investigations of antiferromagnetic spin dynamics have remained unexplored mainly because of the immunity of antiferromagnets to magnetic fields. Furthermore, this immunity makes field-driven antiferromagnetic DW motion impossible despite rich physics of field-driven DW dynamics as proven in ferromagnetic DW studies. Here we show that fast field-driven antiferromagnetic spin dynamics is realized in ferrimagnets at the angular momentum compensation point TA. Using rare-earth-3d-transition metal ferrimagnetic compounds where net magnetic moment is nonzero at TA, the field-driven DW mobility remarkably enhances up to 20 km s −1 T −1 . The collective coordinate approach generalized for ferrimagnets 7 and atomistic spin model simulations 6,8 show that this remarkable enhancement is a consequence of antiferromagnetic spin dynamics at TA. Our finding allows us to investigate the physics of antiferromagnetic spin dynamics and highlights the importance of tuning of the angular momentum compensation point of ferrimagnets, which could be a key towards ferrimagnetic spintronics.Encoding information using magnetic DW motion is essential for future magnetic memory devices, such as racetrack memories 9,10 . High-speed DW motion is a key prerequisite for making the racetrack feasible. However, velocity breakdown due to the angular precession of DW, referred to as the Walker breakdown 11 , generally limits the functional performance in ferromagnet-based DW devices.Recently, it was reported that the DW speed boosts up significantly in antiferromagnets due to the suppression of the angular precession 4-6 . However, the immunity of antiferromagnets to magnetic fields yields notorious difficulties in creating, manipulating, and detecting antiferromagnetic DWs, compared to ferromagnetic ones. One possibility to avoid these difficulties is offered by the synthetic

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confidence: 90%

Section: M mentioning

confidence: 99%

Fast domain wall motion in the vicinity of the angular momentum compensation temperature of ferrimagnets

et al. 2017

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“…In magnetic systems, competition between exchange interactions and magnetic anisotropy determines the ground state. In a case where the inversion symmetry of the system is broken, the antisymmetric exchange interaction called the Dzyaloshinskii-Moriya interaction (DMI) 1 , 2 plays a significant role and causes formation of complex chiral spin structures, such as skyrmion lattices 3 – 5 , domain walls 6 , 7 , and homogeneous spin spiral structures 8 – 10 . Since the inversion symmetry is naturally broken at interfaces, 3 d magnetic ultrathin films formed on 5 d non-magnetic heavy-elemental substrates often exhibit non-collinear chiral spin structures driven by the interfacial DMI (iDMI) 11 – 18 .…”

Section: Introductionmentioning

confidence: 99%

Experimental verification of the rotational type of chiral spin spiral structures by spin-polarized scanning tunneling microscopy

Haze

Yoshida

Hasegawa

2017

Sci Rep

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We report on experimental verification of the rotational type of chiral spin spirals in Mn thin films on a W(110) substrate using spin-polarized scanning tunneling microscopy (SP-STM) with a double-axis superconducting vector magnet. From SP-STM images using Fe-coated W tips magnetized to the out-of-plane and [001] directions, we found that both Mn mono- and double-layers exhibit cycloidal rotation whose spins rotate in the planes normal to the propagating directions. Our results agree with the theoretical prediction based on the symmetry of the system, supporting that the magnetic structures are driven by the interfacial Dzyaloshinskii-Moriya interaction.

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“…Although domain walls have already been employed in spintronics and for designing novel devices [58][59][60], their presently discovered role in optimizing ME responses make them also fascinating for magnetoelectric-based devices. As a matter of fact, our results show that one can tune the frequency of the applied magnetic field with the frequency of the domain wall vibrations (DWI electromagnons) to maximize the ME response.…”

Section: B Frequency Analysismentioning

confidence: 99%

Domain-wall-induced electromagnons in multiferroics

Sayedaghaee

Prosandeev

Prokhorenko

et al. 2022

Phys. Rev. Materials

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Using an atomistic approach, we predict the emergence of new hybrid quasi-particles, namely domain-wall-induced electromagnons, that arise from dynamical couplings between magnons and optical phonons in systems possessing ferroelectric domain walls. These quasi-particles induce THz resonances in magnetoelectric responses and preferentially localize either near the domain walls or near the middle of domains. Such behavior is explained through dispersion analysis that allows to track the emergent multi-domain excitations back to single-domain magnetoelectric (ME) modes. The latter, scattered by a periodic array of domain walls, are shown to endow the domainwall-induced electromagnons with a mixed localized mode and a standing-or propagating-wave characters. Such features can be exploited to reach strikingly large ME conversion and designing more reliable and ultrafast ME devices with less energy consumption and using, e.g., local probes.

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Investigation of domain wall motion in RE-TM magnetic wire towards a current driven memory and logic

Cited by 33 publications

References 24 publications

Fast domain wall motion in the vicinity of the angular momentum compensation temperature of ferrimagnets

Fast domain wall motion in the vicinity of the angular momentum compensation temperature of ferrimagnets

Experimental verification of the rotational type of chiral spin spiral structures by spin-polarized scanning tunneling microscopy

Domain-wall-induced electromagnons in multiferroics

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