Revealing nanoscale disorder in W/CoFeB/MgO ultra-thin films using domain wall motion
arXiv:2208.09280 · doi:10.1103/PhysRevApplied.18.054072
Abstract
Disorder in ultra-thin magnetic films can significantly hinder domain wall motion. One of the main issues on the path towards efficient domain wall based devices remains the characterization of the pinning landscape at the nanoscale. In this paper, we study domain wall motion in W/CoFeB/MgO thin films with perpendicular magnetic anisotropy crystallized by annealing at 400C and a process based on He irradiation combined with elevated temperatures. Magnetic properties are similar for the whole series of samples, while the magnetic domain wall mobility is critically improved in the irradiated samples. By using an analytical model to extract nanoscale pinning parameters, we reveal important variations in the disorder of the crystallized samples. This work offers a unique opportunity to selectively analyze the effects of disorder on the domain wall dynamics, without the contribution of changes in the magnetic properties. Our results highlight the importance of evaluating the nanoscale pinning parameters of the material when designing devices based on domain wall motion, which in return can be a powerful tool to probe the disorder in ultra-thin magnetic films.
arXiv comment22 pages, 12 figures. Currently under review
References in corpus (29)
- The design and verification of Mumax3
- Current-driven dynamics of chiral ferromagnetic domain walls
- Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems
- Creep and flow regimes of magnetic domain wall motion in ultrathin Pt/Co/Pt films with perpendicular anisotropy
- Creep and depinning in disordered media
- Room-temperature current-induced generation and motion of sub-100nm skyrmions
- Spin-Wave Propagation in the Presence of Interfacial Dzyaloshinskii-Moriya Interaction
- Interfacial Dzyaloshinskii-Moriya interaction in perpendicularly-magnetized Pt/Co/AlO ultrathin films measured by Brillouin light spectroscopy
- Current-Driven Skyrmion Dynamics and Drive-Dependent Skyrmion Hall Effect in an Ultrathin Film
- Precise determination of the spectroscopic g-factor using broadband ferromagnetic resonance spectroscopy
- Asymmetric magnetic bubble expansion under in-plane field in Pt/Co/Pt: effect of interface engineering
- Current-driven skyrmion dynamics in disordered films
- Effects of spatially engineered Dzyaloshinskii-Moriya interaction in ferromagnetic films
- Probing the Dzyaloshinskii-Moriya interaction in CoFeB ultrathin films using domain wall creep and Brillouin light spectroscopy
- Universal pinning energy barrier for driven domain walls in thin ferromagnetic films
- Dynamics below the depinning threshold
- Creep dynamics of elastic manifolds via exact transition pathways
- Skyrmion morphology in ultrathin magnetic films
- Universal Depinning Transition of Domain Walls in Ultrathin Ferromagnets
- Determination of intrinsic damping of perpendicularly magnetized ultrathin films from time resolved precessional magnetization measurements
- Effects of Disorder and Internal Dynamics on Vortex Wall Propagation
- Domain Wall-Magnetic Tunnel Junction Spin Orbit Torque Devices and Circuits for In-Memory Computing
- Dzyaloshinskii-Moriya interaction at disordered interfaces from ab initio theory: robustness against intermixing and tunability through dusting
- Spatio-temporal patterns in ultra-slow domain wall creep dynamics
- Creep motion of elastic interfaces driven in a disordered landscape
- Magnetic domain wall creep and depinning: a scalar field model approach
- Excess velocity of magnetic domain walls close to the depinning field
- Magnetic domain wall dynamics in the precessional regime: influence of the Dzyaloshinskii-Moriya interaction
- Strength and length-scale of the interaction between domain walls and pinning disorder in thin ferromagnetic films