Presentation Information
[25a-P01-34]Hall measurements in altermagnet RuO2/NiFe bilayers
〇Hiroyuki Takahashi1, Shutaro Karube1,2, Itaru Sugiura1, Yuta Kobayashi1, Hiroki Matsumoto1, Hideki Narita1, Ryusuke Hisatomi1,2, Yoichi Shiota1,2, Teruo Ono1,2 (1.ICR, Kyoto Univ., 2.CSRN, Kyoto Univ.)
Keywords:
altermagnet,antiferromagnet,spin current
Recently, a new class of magnet called "altermagnet" has attracted much attention in spintronics. Altermagnets can generate a spin current with spin polarization along the Néel vector, referred to as the spin-splitter effect, with a high charge-spin conversion efficiency. Although spin current generation has been experimentally observed in altermagnetic RuO2, the observed conversion efficiency is much lower than a theoretical value. This discrepancy can be originated from the two antiferromagnetic domains along [001] and [00-1] in RuO2 films. We deposited RuO2/NiFe bilayers, defined them into Hallbars with varied wire widths and performed Hall measurements under an applied magnetic field for the devices to selectively detect the contribution of the spin current at the wire intersection. When the wire width is smaller than the domain size of RuO2, spin currents from different domains do not cancel anymore, and thus highly efficient charge-spin conversion can be achieved.