Spin transfer and spin-orbit torques in in-plane magnetized (Ga,Mn)As tracks

Thevenard, L.; Boutigny, Benoit; Güsken, Nicholas A.; Becerra, L.; Ulysse, C.; Shihab, Sylvain; Lemaı̂tre, A.; Kim, Joo-Von; Jeudy, V.; Gourdon, C.

doi:10.1103/physrevb.95.054422

Cited by 12 publications

(6 citation statements)

References 70 publications

(146 reference statements)

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“…We note that a peculiar feature of spin transport in RE-TM ferrimagnets has been observed recently for spin-orbit torque switching 34 but not for DW motion. Another interesting observation is the negative value of 𝛽 in GdFeCo, which is critically different from most, if not all 35 , known magnets. We speculate that this negative 𝛽 may be related to the electron band structure of GdFeCo, as one theory 21 has predicted that 𝛽 can be negative in systems with both holelike and electronlike carriers.…”

Section: 𝛽| 𝛼mentioning

confidence: 68%

Spin-transfer torques for domain wall motion in antiferromagnetically coupled ferrimagnets

Okuno

Kim

et al. 2019

Nat Electron

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Antiferromagnetic materials are outstanding candidates for next generation spintronic applications, because their ultrafast spin dynamics makes it possible to realize several orders of magnitude higher-speed devices than conventional ferromagnetic materials 1 . Though spin-transfer torque (STT) is a key for electrical control of spins as successfully demonstrated in ferromagnetic spintronics, experimental understanding of STT in antiferromagnets has been still lacking despite a number of pertinent theoretical studies 2-5 . Here, we report experimental results on the effects of STT on domain-wall (DW) motion in antiferromagnetically-coupled ferrimagnets. We find that non-adiabatic STT acts like a staggered magnetic field and thus can drive DWs effectively. Moreover, the non-adiabaticity parameter of STT is found to be significantly larger than the Gilbert damping parameter , challenging our conventional understanding of the non-adiabatic STT based on ferromagnets as well as leading to fast current-induced antiferromagnetic DW motion. Our study will lead to further vigorous exploration of STT for antiferromagnetic spin textures for fundamental physics on spin-charge interaction as wells for efficient electrical control of antiferromagnetic devices.Recently, antiferromagnets have attracted great attention because of their potential ability to serve as spintronic material platforms with features distinct from their ferromagnetic counterparts 6,7 . As neighbouring spins are aligned antiparallel in antiferromagnets, magnetic dynamics and spin transport are expected to fundamentally differ from those of ferromagnets 8 .For magnetic dynamics, recent experiments indeed found that field-driven 9 or spin-orbittorque-driven 10,11 DW dynamics in antiferromagnetically coupled ferrimagnets is fastest at the angular momentum compensation temperature where the magnetic dynamics are antiferromagnetic. For spin transport, however, only theoretical studies 2-5 have investigated

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Section: 𝛽| 𝛼mentioning

confidence: 68%

Spin-transfer torques for domain wall motion in antiferromagnetically coupled ferrimagnets

Okuno

Kim

et al. 2019

Nat Electron

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“…This has been realized by growing epitaxial layers on single-crystal substrates. One example is (Ga,Mn)As grown on (001) GaAs (Thevenard et al, 2017), where structures with X domains and Y domains were compared, on 50 nm thick layers so that bulk SOT would be active. Large current-induced effects were observed, that strongly differed in the two cases, but no simple and global understanding of the observed effects could be found.…”

Section: Anisotropic Samples With Y Domainsmentioning

confidence: 99%

Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems

et al. 2019

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“…When the field is switched off (t=17 ns), exchange and magnetostatic energies govern the formation of clear micron-sized fully switched (blue) or unswitched (red) domains. The system has limited the formation of charged transverse domain walls along [110], preferring [44] the less costly Néel walls along [1][2][3][4][5][6][7][8][9][10]. This results in filamentation along the the easy axis.…”

Section: Compatibility Of Multi-domain Formation With Precessionnal S...mentioning

confidence: 99%

Resonant magneto-acoustic switching: influence of Rayleigh wave frequency and wavevector

Kuszewski

Camara

Biarrotte

et al. 2018

J. Phys.: Condens. Matter

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We show on in-plane magnetized thin films that magnetization can be switched efficiently by 180 degrees using large amplitude Rayleigh waves travelling along the hard or easy magnetic axis. Large characteristic filament-like domains are formed in the latter case. Micromagnetic simulations clearly confirm that this multi-domain configuration is compatible with a resonant precessional mechanism. The reversed domains are in both geometries several hundreds of [Formula: see text], much larger than has been shown using spin transfer torque- or field-driven precessional switching. We show that surface acoustic waves can travel at least 1 mm before addressing a given area, and can interfere to create magnetic stripes that can be positioned with a sub-micronic precision.

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Spin transfer and spin-orbit torques in in-plane magnetized (Ga,Mn)As tracks

Cited by 12 publications

References 70 publications

Spin-transfer torques for domain wall motion in antiferromagnetically coupled ferrimagnets

Spin-transfer torques for domain wall motion in antiferromagnetically coupled ferrimagnets

Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems

Resonant magneto-acoustic switching: influence of Rayleigh wave frequency and wavevector

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