Coherent Microwave Driving of Domain Wall Depinning in a Ferrimagnetic Garnet

Abstract

Coherent control of domain wall dynamics offers a route to fast manipulation of magnetic textures beyond thermally activated motion. We demonstrate resonant excitation of linear and nonlinear dynamics of a pinned domain wall in a ferrimagnetic garnet thin film driven by a microwave field. Using scanning nitrogen-vacancy magnetometry and nonlocal spin-pumping measurements, we identify a low-frequency mode inside the magnon gap, originating from the localized oscillatory motion of a domain wall across a pinning line defined by a Pt stripline. Upon increasing the microwave drive into the nonlinear regime, this mode enables domain wall depinning at reduced external magnetic fields. Micromagnetic simulations reveal a progression from localized oscillations to partial relocation between pinning sites and, ultimately, complete escape from the pinning region with increasing driving power. These results establish resonant excitation of domain walls at engineered pinning sites as a mechanism for manipulating magnetic textures via localized nonlinear dynamics.

References in corpus (13)

• Magnetic texture based magnonics
• Pinning dependent field driven domain wall dynamics and thermal scaling in an ultrathin Pt/Co/Pt magnetic film
• Current-driven dynamics and ratchet effect of skyrmion bubbles in a ferrimagnetic insulator
• Domain Wall-Magnetic Tunnel Junction Spin Orbit Torque Devices and Circuits for In-Memory Computing
• Excess velocity of magnetic domain walls close to the depinning field
• Orbital Pumping in Ferrimagnetic Insulators
• Strength and length-scale of the interaction between domain walls and pinning disorder in thin ferromagnetic films
• Lattice-tunable substituted iron garnets for low-temperature magnonics
• Current-Controlled Magnon-Magnon Coupling in an On-Chip Cavity Resonator
• Non-local magnon transport in a magnetic domain wall wave guide
• Ultrathin bismuth-yttrium iron garnet films with tunable magnetic anisotropy
• Observation and Control of Chiral Spin Frustration in BiYIG Thin Films
• Spin wave resonance in yttrium iron garnet stripe domains