Atomically sharp domain walls in an antiferromagnet

Hysteretic effects and magnetotransport of electrically switched CuMnAs

“…In contrast, our study of the quench switching signal shows that this mechanism is insensitive to fields that are significantly larger than the Néel vector reorientation (domain wall motion) fields. Furthermore, recent DPC-STEM measurements have revealed additional antiferromagnetic textures in CuMnAs in the form of atomically sharp 180 • domain walls [19]. Combined with our high-field MR measurements, we surmise that these sharp domain walls can be responsible for the high resistance of the quench-switched state.…”

“…5). In the following paragraphs, we discuss these results in the context of the recently published microscopy [19] and transport measurements [17].…”

“…This unipolar mechanism, which is principally distinct from the spin-orbit torque reorientation of the Néel vector, was called a quench switching. In addition, recent imaging by differential-phase-contrast scanning transmission electron microscopy (DPC-STEM) [19] has revealed that complex magnetic textures in CuMnAs can even include atomically sharp 180 • domain walls.…”

Anomalous Hall antiferromagnets

“…They have also demonstrated electrical and optical writing pulse-lengths from millisecond to femtosecond, analog time-dependent logic-in-memory functionalities reminiscent of neuromorphic computing elements, and in-formation coding into metastable atomic-scale magnetic textures. 59,[61][62][63][65][66][67][68][69][70][71]174,175 Ferromagnetic digital memories, on the other hand, owe their commercial success primarily to the giant magnetoresistive readout signals and efficient spin transfer torque writing, relying on spinconserving electron transport. [92][93][94][95][96] The discovery of the Hall effect in the compensated collinear magnets has led directly to a theory proposal that the essential spintronic reading and writing principles based on conserved spin-currents should be readily available in these systems.…”

Parameterization of magnetic vector potentials and fields for efficient multislice calculations of elastic electron scattering

“…Third, for computational efficiency, the determination of magnetic quantities at a given grid point should depend solely on local structural and magnetic moment size and direction information. This paper presents the quasi-dipole approach, satisfying all of the above criteria and thereby streamlining the implementation of magnetic potentials and fields, along with the associated Pauli multislice method 3,5 , into the growing ecosystem of methods in microscopy that take account of magnetic effects in materials 4,7,[19][20][21][22][23][24][25][26][27][28] .…”