All‐Electric Spin Device Operation Using the Weyl Semimetal, WTe2, at Room Temperature

• Published in: Advanced electronic materials 2023-01, Vol.9 (1), p.n/a
• Main Authors: Ohnishi, Kosuke, Aoki, Motomi, Ohshima, Ryo, Shigematsu, Ei, Ando, Yuichiro, Takenobu, Taishi, Shiraishi, Masashi
• Format: Article
• Language: English
• Subjects: Broken symmetry; Electrodes; Electromagnetism; Electrons; Hall effect; Magnetic fields; Magnetoresistance; Magnetoresistivity; Polarization (spin alignment); Room temperature; Spectrum analysis; spin detection; spintronics; Symmetry; symmetry breaking; Temperature; topological quantum materials; Weyl semimetals
• ISSN: 2199-160X; 2199-160X
• DOI: 10.1002/aelm.202200647

Topological quantum materials (TQMs) possess abundant and attractive spin physics, and a Weyl semimetal is the representative material because of the generation of spin polarization that is available for spin devices due to its Weyl nature. Meanwhile, a Weyl semimetal allows the other but unexplored spin polarization due to local symmetry breaking. Here, all‐electric spin device operation using a type‐II Weyl semimetal, WTe2, at room temperature is reported. The polarization of spins propagating in the all‐electric device is perpendicular to the WTe2 plane, which is ascribed to local in‐plane symmetry breaking in WTe2, yielding the spin polarization creation of propagating charged carriers, namely, the spin‐polarized state creation from the nonpolarized state. Systematic control experiments unequivocally negate unexpected artifacts, such as the anomalous Hall effect, the anisotropic magnetoresistance, etc. Creation of all‐electric spin devices made of TQMs and their operation at room temperature can pave a new pathway for novel spin devices made of TQMs resilient to thermal fluctuation. All‐electric spin device operation using a type‐II Weyl semimetal, WTe2, at room temperature is achieved. The polarization of spins propagating in the all‐electric device is perpendicular to the WTe2 plane, which is ascribed to local in‐plane symmetry breaking in WTe2, yielding the spin polarization creation of propagating charged carriers, namely, the spin‐polarized state creation from the nonpolarized state. Creation of all‐electric spin devices made of topological quantum materials (TQMs) and their operation at room temperature can pave a new pathway for novel spin devices made of TQMs resilient to thermal fluctuation.