Abstract
Possibility of in-plane and out-of-plane magnetization generated by synchrotron radiation (SR) in magnetically doped and pristine topological insulators (TIs) is demonstrated and studied by angle-resolved photoemission spectroscopy. We show experimentally and by ab initio calculations how nonequal depopulation of the Dirac cone (DC) states with opposite momenta in V-doped and pristine TIs generated by linearly polarized SR leads to the hole-generated uncompensated spin accumulation followed by the SR-induced magnetization via spin-torque effect. Moreover, the photoexcitation of the DC is asymmetric, and it varies with the photon energy. We find a relation between the photoexcitation asymmetry, the generated spin accumulation, and the induced in-plane and out-of-plane magnetic field. Experimentally the SR-generated in-plane and out-of-plane magnetization is confirmed by the k shift of the DC position and by the gap opening at the Dirac point even above the Curie temperature. Theoretical predictions and estimations of the measurable physical quantities substantiate the experimental results.
Original language | English |
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Article number | 245407 |
Journal | Physical Review B |
Volume | 97 |
Issue number | 24 |
DOIs | |
Publication status | Published - 11 Jun 2018 |
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Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
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Signatures of in-plane and out-of-plane magnetization generated by synchrotron radiation in magnetically doped and pristine topological insulators. / Shikin, A. M.; Rybkina, A. A.; Estiunin, D. A.; Sostina, D. M.; Voroshnin, V. Yu; Klimovskikh, I. I.; Rybkin, A. G.; Surnin, Yu A.; Kokh, K. A.; Tereshchenko, O. E.; Petaccia, L.; Di Santo, G.; Skirdkov, P. N.; Zvezdin, A. K.; Zvezdin, A. K.; Kimura, A.; Chulkov, E. V.; Krasovskii, E. E.
In: Physical Review B, Vol. 97, No. 24, 245407, 11.06.2018.Research output
TY - JOUR
T1 - Signatures of in-plane and out-of-plane magnetization generated by synchrotron radiation in magnetically doped and pristine topological insulators
AU - Shikin, A. M.
AU - Rybkina, A. A.
AU - Estiunin, D. A.
AU - Sostina, D. M.
AU - Voroshnin, V. Yu
AU - Klimovskikh, I. I.
AU - Rybkin, A. G.
AU - Surnin, Yu A.
AU - Kokh, K. A.
AU - Tereshchenko, O. E.
AU - Petaccia, L.
AU - Di Santo, G.
AU - Skirdkov, P. N.
AU - Zvezdin, A. K.
AU - Zvezdin, A. K.
AU - Kimura, A.
AU - Chulkov, E. V.
AU - Krasovskii, E. E.
PY - 2018/6/11
Y1 - 2018/6/11
N2 - Possibility of in-plane and out-of-plane magnetization generated by synchrotron radiation (SR) in magnetically doped and pristine topological insulators (TIs) is demonstrated and studied by angle-resolved photoemission spectroscopy. We show experimentally and by ab initio calculations how nonequal depopulation of the Dirac cone (DC) states with opposite momenta in V-doped and pristine TIs generated by linearly polarized SR leads to the hole-generated uncompensated spin accumulation followed by the SR-induced magnetization via spin-torque effect. Moreover, the photoexcitation of the DC is asymmetric, and it varies with the photon energy. We find a relation between the photoexcitation asymmetry, the generated spin accumulation, and the induced in-plane and out-of-plane magnetic field. Experimentally the SR-generated in-plane and out-of-plane magnetization is confirmed by the k shift of the DC position and by the gap opening at the Dirac point even above the Curie temperature. Theoretical predictions and estimations of the measurable physical quantities substantiate the experimental results.
AB - Possibility of in-plane and out-of-plane magnetization generated by synchrotron radiation (SR) in magnetically doped and pristine topological insulators (TIs) is demonstrated and studied by angle-resolved photoemission spectroscopy. We show experimentally and by ab initio calculations how nonequal depopulation of the Dirac cone (DC) states with opposite momenta in V-doped and pristine TIs generated by linearly polarized SR leads to the hole-generated uncompensated spin accumulation followed by the SR-induced magnetization via spin-torque effect. Moreover, the photoexcitation of the DC is asymmetric, and it varies with the photon energy. We find a relation between the photoexcitation asymmetry, the generated spin accumulation, and the induced in-plane and out-of-plane magnetic field. Experimentally the SR-generated in-plane and out-of-plane magnetization is confirmed by the k shift of the DC position and by the gap opening at the Dirac point even above the Curie temperature. Theoretical predictions and estimations of the measurable physical quantities substantiate the experimental results.
UR - http://www.scopus.com/inward/record.url?scp=85048456503&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.97.245407
DO - 10.1103/PhysRevB.97.245407
M3 - Article
AN - SCOPUS:85048456503
VL - 97
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 24
M1 - 245407
ER -