Spin-Transfer-Torque Induced Spatially Nonuniform Switching in Ferrimagnets
arXiv:2401.01741 · doi:10.1063/5.0179040
Abstract
Ferrimagnet (FiM), (FeCo)1-xGdx, attracts research attention due to its ultrafast magnetic dynamics and finite net magnetization. Incorporating FiM into the magnetic tunnel junction will be beneficial to further improve the writing speed of magnetic random access memory (MRAM). It is commonly assumed that the FeCo and Gd atoms are switched together due to the strong exchange coupling, which remains valid even if one performs the two-sublattice macrospin simulation. Interestingly, using the atomistic model developed by our group, it is clearly seen that different atoms are not switched together. In addition, our study reveals that the nature of switching is spatially nonuniform even in the small sample with the dimension of 20 nm-20 nm. Furthermore, the characteristics of nonuniformity are completely different for samples with different Gd composition (x). When x is close to the magnetization compensation point, successful switching cannot be obtained, but is accompanied by the stable oscillation. The atom type that dominates the oscillation is different from that predicted by the two-sublattice macrospin model. In addition, the size of singular region is a non-monotonic function of current density. All these results can only be understood by considering the spatial nonuniform magnetization dynamics.
References in corpus (24)
- Electrical switching of an antiferromagnet
- Atomistic spin model simulations of magnetic nanomaterials
- Vowel recognition with four coupled spin-torque nano-oscillators
- Fast domain wall motion induced by antiferromagnetic spin dynamics at the angular momentum compensation temperature of ferrimagnets
- Time- and spatially-resolved magnetization dynamics driven by spin-orbit torques
- Field-free spin-orbit torque-induced switching of perpendicular magnetization in a ferrimagnetic layer with vertical composition gradient
- Ultrafast Magnetization Reversal by Picosecond Electrical Pulses
- Shape anisotropy revisited in single-digit nanometer magnetic tunnel junctions
- Vanishing skyrmion Hall effect at the angular momentum compensation temperature of a ferrimagnet
- Experimental demonstration of complete 180 degree reversal of magnetization in isolated Co-nanomagnets on a PMN-PT substrate with voltage generated strain
- Spin-Orbit Torques in ferrimagnetic GdFeCo Alloys
- Magnetization switching in polycrystalline Mn3Sn thin film induced by self-generated spin-polarized current
- Ultrafast dynamical path for the switching of a ferrimagnet after femtosecond heating
- Strong variation of spin-orbit torques with relative spin relaxation rates in ferrimagnets
- Coupled skyrmion breathing modes in synthetic ferri- and antiferromagnets
- Thermally nucleated magnetic reversal in CoFeB/MgO nanodots
- Identification of Néel vector orientation in antiferromagnetic domains switched by currents in NiO/Pt thin films
- Multi-scale modelling of current-induced switching in magnetic tunnel junctions using ab initio spin transfer torques
- Tuning Dzyaloshinskii-Moriya Interaction in Ferrimagnetic GdCo: A First Principles Approach
- Tunable Magnetic Skyrmions in Ferrimagnetic MnN
- Electrical generation and detection of terahertz signal based on spin-wave emission from ferrimagnets
- Atomistic modeling of magnetization reversal modes in FePt nanodots with magnetically soft edges
- Spatially Nonuniform Oscillations in Ferrimagnets Based on an Atomistic Model
- Theoretical Proposal for Determining Angular Momentum Compensation in Ferrimagnets