| 1. |
- Gupta, Pankhuri, et al.
(författare)
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Generation of out-of-plane polarized spin current in (permalloy, Cu)/EuS interfaces
- 2024
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Ingår i: PHYSICAL REVIEW B. - 2469-9950 .- 2469-9969. ; 109:6
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Tidskriftsartikel (refereegranskat)abstract
- The generation of out-of-plane polarized spin current is crucial for efficiently manipulating perpendicularly magnetized systems used in high-density magnetic recording. Here, we demonstrate the generation of out-of-plane polarized spin current at room temperature using an insulator, EuS. By employing angleresolved spin-torque ferromagnetic resonance, we find a large unconventional out-of-plane torque conductivity, sigma zDL = -0.13 x 105( h over bar /2e) (S2 m)-1 in the Py(= Ni81Fe19)/EuS bilayer, which is comparable to the conventional in-plane dampinglike torque conductivity, sigma yDL. Additionally, a giant in-plane fieldlike torque (sigma zFL) with a magnitude of 27 times larger than that of the conventional out-of-plane fieldlike torque (sigma yFL) is also observed in the Py/EuS bilayer. The unconventional torques due to the out-of-plane polarized spin current (sigma zDL and sigma zFL) persist even by inserting a 10-nm-thick Cu layer between Py and EuS. Our findings demonstrate that the unconventional torques in these systems originate from the interfaces through spin swapping and/or spin-orbit precession mechanisms.
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| 2. |
- Khan, Kacho Imtiyaz Ali, et al.
(författare)
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Magnetodynamic properties of ultrathin films of Fe3Sn2 -a topological kagome ferromagnet
- 2024
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Ingår i: SCIENTIFIC REPORTS. - 2045-2322. ; 14:1
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Tidskriftsartikel (refereegranskat)abstract
- Fe3Sn2 is a topological kagome ferromagnet that possesses numerous Weyl points close to the Fermi energy, which can manifest various unique transport phenomena such as chiral anomaly, anomalous Hall effect, and giant magnetoresistance. However, the magnetodynamic properties of Fe3Sn2 have not yet been explored. Here, we report, for the first time, the measurements of the intrinsic Gilbert damping constant (alpha(int)), and the effective spin mixing conductance (g(eff)(up arrow down arrow)) of Pt/Fe3Sn2 bilayers for Fe3Sn2 thicknesses down to 2 nm, for which alpha(int) is (3.8 +/- 0.2)x10(-2), and g(eff)(up arrow down arrow) is (11.7 +/- 0.6) nm(-2). The films have a high saturation magnetization, M-S=620 emu cm(-3), and large anomalous Hall coefficient, R-S=4.6x10(-10) Omega cm G(-1). The large values of g(eff)(up arrow down arrow), together with the topological properties of Fe3Sn2, make Fe3Sn2/Pt bilayers useful heterostructures for the study of topological spintronic devices.
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| 3. |
- Mudgal, Richa, et al.
(författare)
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Magnetic-Proximity-Induced Efficient Charge-to-Spin Conversion in Large-Area PtSe2/Ni80Fe20 Heterostructures
- 2023
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Ingår i: NANO LETTERS. - 1530-6984 .- 1530-6992. ; 23:24, s. 11925-11931
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Tidskriftsartikel (refereegranskat)abstract
- As a topological Dirac semimetal with controllable spin-orbit coupling and conductivity, PtSe2, a transition-metal dichalcogenide, is a promising material for several applications, from optoelectrics to sensors. However, its potential for spintronics applications has yet to be explored. In this work, we demonstrate that the PtSe2/Ni80Fe20 heterostructure can generate large damping-like current-induced spin-orbit torques (SOT), despite the absence of spin-splitting in bulk PtSe2. The efficiency of charge-to-spin conversion is found to be -0.1 +/- 0.02 nm(-1) in PtSe2/Ni80Fe20, which is 3 times that of the control sample, Ni80Fe20/Pt. Our band structure calculations show that the SOT due to PtSe2 arises from an unexpectedly large spin splitting in the interfacial region of PtSe2 introduced by the proximity magnetic field of the Ni80Fe20 layer. Our results open up the possibilities of using large-area PtSe2 for energy-efficient nanoscale devices by utilizing proximity-induced SOT.
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