Generation and manipulation of domain walls using a thermal gradient in a ferrimagnetic TbCo wire

Tolley, Robert; Liu, T.; Xu, Yong; Gall, Sylvain Le; Gottwald, Matthias; Hauet, Thomas; Hehn, M.; Montaigne, F.; Fullerton, Eric E.; Mangin, Stéphane

doi:10.1063/1.4922603

Cited by 18 publications

(14 citation statements)

References 22 publications

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“…The depositions were performed at room temperature under 3.7 mTorr of Ar with a base pressure of 3 Â 10 À7 Torr, using thermally-oxidized Si substrates. The net magnetization of these two compositions is expected [40][41][42] to be Co dominated and Tb dominated, respectively, at room temperature.…”

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confidence: 96%

“…31,32 Bulk PMA materials, such as L10-ordered alloys (FePt, FePd, CoPt, etc. ), [32][33][34][35] Heusler alloys, 36,37 and rare earth-transition metal (RE-TM) alloys, 14,[29][30][31][38][39][40][41][42][43][44] are potential candidates for devices since these materials provide a considerably larger volume anisotropy energy barrier. Furthermore, since the PMA of these materials is less sensitive to the nature of the interfaces, the adjacent layer materials can be optimized to maximize the SOTs without impacting the PMA.…”

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confidence: 99%

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Spin-orbit torques in Ta/TbxCo100-x ferrimagnetic alloy films with bulk perpendicular magnetic anisotropy

Ueda

Mann

Pai

et al. 2016

Applied Physics Letters

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We quantified the bulk perpendicular magnetic anisotropy (PMA) and spin-orbit torques (SOTs) in bilayer Ta/TbxCo100-x ferrimagnetic alloy films with varying Tb concentration. The coercivity increases dramatically with increasing TbxCo100-x thickness and is enhanced by the presence of a Ta underlayer. The Ta underlayer simultaneously serves as a source of SOT due to the spin Hall effect, which we show provides an efficient means to manipulate the magnetization in bulk PMA materials. It is further shown that the sign of the anomalous Hall voltage is different for rare-earth (RE) and transition-metal (TM) dominated alloy compositions, whereas the sign of the SOT effective field remains the same, suggesting that the former is related to the TM sublattice magnetization whereas the latter is related to the net magnetization. Our results suggest that Ta/TbxCo100-x is a potential candidate for spin-orbitronic device applications and give insight into spin transport and SOTs in rare-earth/transition-metal alloys.

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confidence: 96%

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confidence: 99%

Spin-orbit torques in Ta/TbxCo100-x ferrimagnetic alloy films with bulk perpendicular magnetic anisotropy

Ueda

Mann

Pai

et al. 2016

Applied Physics Letters

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“…That is why ferrimagnetic materials can exhibit a vanishingly small magnetization and yet a sizable spin polarization, both tunable by acting on the composition of alloys or by changing the temperature [8,10,11]. A few results exist showing clear DWM under current in ferrimagnets [12][13][14].…”

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confidence: 99%

Strong current actions on ferrimagnetic domain walls in the creep regime

et al. 2019

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We observe domain-wall (DW) motion in ferrimagnetic TbFe wires with perpendicular anisotropy under combined field and current in the creep regime. The current action on the DW is double: Joule heating and spin-transfer torque. We propose a genuinely robust analysis of velocity, separating thermal effects and spin-transfer torque, quantifying the latter as an equivalent field in the so-called one-dimensional (1D) model. Its efficiency is much larger than in transition-metal ferromagnets above room temperature. The equivalent field reveals the large polarization-to-magnetization ratio in ferrimagnets despite a vanishing M s. The usual 1D DW model is extended to mimic creep and predicts that, in low net magnetization systems, the internal DW structure precesses with currents above a field-independent threshold, leading to two propagation regimes with different mobilities. This is another example of how the internal DW magnetization is relevant in creep. We could not detect experimentally these two regimes, possibly because of the dispersion of the data.

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“…In the RE-TM alloys, where RE and TM sublattices are antiferromagnetically coupled, the net magnetic moment can be tuned easily by varying the RE-TM composition and temperature due to different concentrations and temperature dependences of the two sublattices. 17,18 As a result, the system can become either RE dominant (the net magnetization is along the RE magnetization direction) or TM dominant, and there exists the magnetic compensation point where the RE and TM magnetizations are cancelled out, resulting in zero net magnetization.…”

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confidence: 99%

Spin-orbit torque-induced switching in ferrimagnetic alloys: Experiments and modeling

Rojas-Sánchez

Pham

et al. 2018

Applied Physics Letters

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We investigate spin-orbit torque (SOT)-induced switching in rare-earth-transition metal ferrimagnetic alloys using W/CoTb bilayers. The switching current is found to vary continuously with the alloy concentration, and no reduction in the switching current is observed at the magnetic compensation point despite a very large SOT efficiency. A model based on coupled Landau-Lifschitz-Gilbert (LLG) equations shows that the switching current density scales with the effective perpendicular anisotropy which does not exhibit strong reduction at the magnetic compensation, explaining the behavior of the switching current density. This model also suggests that conventional SOT effective field measurements do not allow one to conclude whether the spins are transferred to one sublattice or just simply to the net magnetization. The effective spin Hall angle measurement shows an enhancement of the spin Hall angle with the Tb concentration which suggests an additional SOT contribution from the rare earth Tb atoms.

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Generation and manipulation of domain walls using a thermal gradient in a ferrimagnetic TbCo wire

Abstract: Magnetoresistive effects in perpendicularly magnetized Tb-Co alloy based thin films and spin valves

Cited by 18 publications

References 22 publications

Spin-orbit torques in Ta/TbxCo100-x ferrimagnetic alloy films with bulk perpendicular magnetic anisotropy

Spin-orbit torques in Ta/TbxCo100-x ferrimagnetic alloy films with bulk perpendicular magnetic anisotropy

Strong current actions on ferrimagnetic domain walls in the creep regime

Spin-orbit torque-induced switching in ferrimagnetic alloys: Experiments and modeling

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