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Temperature and Electric Field Dependence of Spin Relaxation in Graphene on SrTiO3
Chen, S., Ruiter, R., Mathkar, V., van Wees, B. J. & Banerjee, T., Nov-2018, In : Physica status solidi-Rapid research letters. 12, 11, 7 p., 1800216.Research output: Contribution to journal › Article › Academic › peer-review
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Temperature and Electric Field Dependence of Spin Relaxation in Graphene on SrTiO3. / Chen, Si; Ruiter, Roald; Mathkar, Vikramaditya; van Wees, Bart J.; Banerjee, Tamalika.
In: Physica status solidi-Rapid research letters, Vol. 12, No. 11, 1800216, 11.2018.Research output: Contribution to journal › Article › Academic › peer-review
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TY - JOUR
T1 - Temperature and Electric Field Dependence of Spin Relaxation in Graphene on SrTiO3
AU - Chen, Si
AU - Ruiter, Roald
AU - Mathkar, Vikramaditya
AU - van Wees, Bart J.
AU - Banerjee, Tamalika
PY - 2018/11
Y1 - 2018/11
N2 - The theoretically predicted intrinsic spin relaxation time of up to 1 mu s in graphene along with extremely high mobilities makes it a promising material in spintronics. Numerous experimental studies, however, find the spin lifetime in graphene to be several orders of magnitude below that theoretically predicted. Additionally, analyses of the spin relaxation mechanisms in graphene using conventional processes such as Elliot-Yaffet and D'yakonov-Perel' show a coexistence of both, with no clear dominance. Central to these experimental discrepancies is the role of the local environment including that of the underlying substrate. In this work, we use the electronically rich platform of SrTiO3 with broken inversion symmetry and study spin transport in graphene in the presence of surface electric fields. We find spin relaxation time and length as large as 0.96 +/- 0.03 ns and 4.1 +/- 0.1 mu m, respectively at 290 K in graphene, using non-local spin valve studies and find a non monotonous dependence with temperature, unlike that observed in other substrates. Analysis of the temperature dependence indicates the role of surface electric dipoles and electric field driven electronic and structural phase transitions unique to SrTiO3 for spin transport and spin relaxation in graphene.
AB - The theoretically predicted intrinsic spin relaxation time of up to 1 mu s in graphene along with extremely high mobilities makes it a promising material in spintronics. Numerous experimental studies, however, find the spin lifetime in graphene to be several orders of magnitude below that theoretically predicted. Additionally, analyses of the spin relaxation mechanisms in graphene using conventional processes such as Elliot-Yaffet and D'yakonov-Perel' show a coexistence of both, with no clear dominance. Central to these experimental discrepancies is the role of the local environment including that of the underlying substrate. In this work, we use the electronically rich platform of SrTiO3 with broken inversion symmetry and study spin transport in graphene in the presence of surface electric fields. We find spin relaxation time and length as large as 0.96 +/- 0.03 ns and 4.1 +/- 0.1 mu m, respectively at 290 K in graphene, using non-local spin valve studies and find a non monotonous dependence with temperature, unlike that observed in other substrates. Analysis of the temperature dependence indicates the role of surface electric dipoles and electric field driven electronic and structural phase transitions unique to SrTiO3 for spin transport and spin relaxation in graphene.
KW - graphene
KW - graphene-oxide interface
KW - spin-orbit coupling
KW - spintronic materials
KW - SrTiO3
KW - STRONTIUM-TITANATE
KW - FABRICATION
KW - TRANSPORT
KW - SURFACE
U2 - 10.1002/pssr.201800216
DO - 10.1002/pssr.201800216
M3 - Article
VL - 12
JO - Physica status solidi-Rapid research letters
JF - Physica status solidi-Rapid research letters
SN - 1862-6270
IS - 11
M1 - 1800216
ER -
ID: 71843413