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High Spin to Charge Conversion Efficiency in Electron Beam-Evaporated Topological Insulator Bi2Se3
- Braj Bhusan Singh*Braj Bhusan Singh*Email: [email protected]Laboratory for Nanomagnetism and Magnetic Materials (LNMM), School of Physical Sciences, National Institute of Science Education and Research (NISER), HBNI, Jatni, Khurda 752050, IndiaMore by Braj Bhusan Singh
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- Sukanta Kumar JenaSukanta Kumar JenaLaboratory for Nanomagnetism and Magnetic Materials (LNMM), School of Physical Sciences, National Institute of Science Education and Research (NISER), HBNI, Jatni, Khurda 752050, IndiaMore by Sukanta Kumar Jena
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- Manisha SamantaManisha SamantaNew Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, IndiaMore by Manisha Samanta
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- Kanishka BiswasKanishka BiswasNew Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, IndiaMore by Kanishka Biswas
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- Subhankar Bedanta*Subhankar Bedanta*Email: [email protected]Laboratory for Nanomagnetism and Magnetic Materials (LNMM), School of Physical Sciences, National Institute of Science Education and Research (NISER), HBNI, Jatni, Khurda 752050, IndiaMore by Subhankar Bedanta
Abstract
Bi2Se3 is a well-established topological insulator (TI) having spin momentum locked Dirac surface states at room temperature and predicted to exhibit high spin to charge conversion efficiency (SCCE) for spintronics applications. The SCCE in TIs is characterized by an inverse Edelstein effect length (λIREE). We report an λIREE of ∼0.36 nm, which is the highest ever observed in Bi2Se3. Here, we performed spin pumping and inverse spin Hall effect (ISHE) in an electron beam-evaporated Bi2Se3/CoFeB bilayer. The Bi2Se3 thickness dependence of λIREE, perpendicular surface anisotropy (KS), spin mixing conductance, and spin Hall angle confirmed that spin to charge conversion is due to spin momentum locked Dirac surface states. We propose that the role of surface states in SCCE can be understood by the evaluation of KS. The SCCE is found to be high when the value of KS is small.
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