Antiferromagnetic nanoscale bit arrays of magnetoelectric Cr${}_2$O${}_3$ thin films

Abstract

Magnetism of oxide antiferromagnets (AFMs) has been studied in single crystals and extended thin films. The properties of AFM nanostructures still remain underexplored. Here, we report on the fabrication and magnetic imaging of granular 100-nm-thick magnetoelectric Cr${}_2$O${}_3$ films patterned in circular bits with diameters ranging from 500 down to 100 nm. With the change of the lateral size, the domain structure evolves from a multidomain state for larger bits to a single domain state for the smallest bits. Based on spin-lattice simulations, we show that the physics of the domain pattern formation in granular AFM bits is primarily determined by the energy dissipation upon cooling, which results in motion and expelling of AFM domain walls of the bit. Our results provide a way towards the fabrication of single domain AFM-bit-patterned memory devices and the exploration of the interplay between AFM nanostructures and their geometric shape.

References in corpus (17)

• Robust isothermal electric switching of interface magnetization: A route to voltage-controlled spintronics
• Purely Antiferromagnetic Magnetoelectric Random Access Memory
• Electrical control of magnetism by electric field and current-induced torques
• Equilibrium magnetization at the boundary of a magnetoelectric antiferromagnet
• Nanoscale mechanics of antiferromagnetic domain walls
• Observation of magnon-polarons in a uniaxial antiferromagnetic insulator
• Voltage-based magnetization switching and reading in magnetoelectric spin-orbit nanodevices
• Finite-size scaling effect on Néel temperature of antiferromagnetic Cr${}_2$O${}_3$-(0001) films in an exchange-coupled heterostructure
• Current-driven writing process in antiferromagnetic Mn2Au for memory applications
• Robust spin-transfer torque and magnetoresistance in non-collinear antiferromagnetic junctions
• Direct Imaging of Electrical Switching of Antiferromagnetic Néel Order in $\alpha$-Fe${}_2$O${}_3$ Epitaxial Films
• Defect-driven antiferromagnetic domain walls in CuMnAs films
• Untrained physically informed neural network for image reconstruction of magnetic field sources
• Role of substrate clamping on anisotropy and domain structure in the canted antiferromagnet $\alpha$-Fe${}_2$O${}_3$
• Strain-induced Shape Anisotropy in Antiferromagnetic Structures
• Intrinsic staggered spin-orbit torque for the electrical control of antiferromagnets -- application to CrI${}_3$
• Laser-induced Creation of antiferromagnetic 180-degree domains in NiO/Pt bilayers