Spin to Charge Conversion in Semiconducting Antiferromagnetic Co₃O₄

Abstract

Power efficient and faster spintronic devices require high spin current propagation efficiency from a ferromagnet (FM) to high spin orbit coupling material. Antiferromagnets (AFM) exhibiting high spin orbit coupling and faster spin dynamics have drawn great attention in such studies. Efficient spin current propagation in metallic AFMs via conduction electron showed promising results in spin to charge conversion physics. Recently, the insulating AFMs are also found to exhibit efficient spin current propagation due to the presence of magnonic modes. The semiconducting AFM Co 3 O 4 is expected to show promising results in spin to charge conversion studies due to the simultaneous presence of magnon modes and conduction electrons. In this context, spin pumping and inverse spin Hall effect studies are carried out on a series of Co 3 O 4 (t nm)/Co(22 nm) samples where the t value varies from 0 to 26 nm. Damping analysis reveals that the spin diffusion length of Co 3 O 4 is 2.5 ± 0.5 nm which is large in comparison to metallic AFMs. The maximum Hall angle of Co 3 O 4 is found to be 0.26. A high spin transparency of 65.8% indicates efficient spin current propagation in the samples.

Binder-Free CoMn2O4 Nanoflower Particles/Graphene/Carbon Nanotube Composite Film for a High-Performance Lithium-Ion Battery

“…In recent decades, transition metal oxides (TMOs) have gained significant attention due to their structural diversity and unique electron transport properties that result from the properties of the outer d electrons. They offer promising applications in various fields such as spintronics and thermoelectrics [7][8][9]. As research continues, complex transition metal oxides, with a general formula of X x Y 3-x O 4 (X, Y = Fe, Co, Ni, Zn, Mn, etc.…”