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Ferromagnetic Dynamics - Markdown

Solutions to LLGS Equation for a FM

Toward multiple-bit-per-cell memory operation with stable resistance levels in phase change nanodevices

Published in IEEE Transactions on Electron Devices, 2016

This paper demonstrates a stable intermediate state in multilevel phase change memory (PCM) cells, achieved through nonuniform heating with a square current injection top electrode, which shows significantly reduced resistance drift and enhances the potential for reliable, high-density PCM technology.

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First harmonic measurements of the spin Seebeck effect

Published in Applied Physical Letters (APL), 2018

This study presents a method combining AC and DC currents to measure the spin Seebeck effect (SSE) in YIG/Pt bilayers, showing that this approach enhances the SSE response and allows for exploration of nonlinear thermoelectric effects and spin dynamics under temperature gradients.

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Efficient spin current generation in low-damping Mg(Al,Fe)₂O₄ thin films

Published in Applied Physical Letters (APL), 2019

Low-damping Mg(Al,Fe)₂O₄ (MAFO) magnetic insulator thin films are promising for spin current-based spintronics, showing efficient spin current injection and high spin-wave frequencies, making them versatile alternatives to YIG for spin-transfer applications.

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Spin transport in an insulating ferrimagnetic-antiferromagnetic-ferrimagnetic trilayer as a function of temperature

Published in AIP Advances, 2019

This study investigates spin current transport in a YIG/NiO/YIG trilayer, revealing a spin Seebeck effect (SSE) signal increase at low temperatures due to paramagnetic effects in the GGG substrate, and identifying NiO’s spin diffusion length as ∼3.8 nm, which aids understanding of spin currents in magnetic insulators.

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Precessional spin-torque dynamics in biaxial antiferromagnets

Published in Physical Review B, 2021

This study describes the controlled precession of Néel order in biaxial antiferromagnets under spin torque, showing that in-plane and normal spin polarization components can stabilize the motion, with hysteretic behavior and threshold spin currents linked to anisotropy; it also proposes a device setup for tuning terahertz nano-oscillations.

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Direct imaging of electrical switching of antiferromagnetic Néel order in α-Fe₂O₃ epitaxial films

Published in Physical Review B, 2021

This study demonstrates that electrical pulses can reversibly and irreversibly switch the Néel vector of antiferromagnetic domains in Pt/α-Fe₂O₃ structures, revealing both spin-orbit torque effects and thermal contributions to the domain changes.

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Thermal Effects in Spin-Torque Switching of Perpendicular Magnetic Tunnel Junctions at Cryogenic Temperatures

Published in Physical Review Applied, 2021

This study examines the temperature-dependent spin-torque switching probability in magnetic tunnel junction nanopillars, revealing that junction heating affects switching behavior below 75 K and leads to stochastic switching down to 4 K due to reduced thermal conductivity and heat capacity.

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Current Induced Spin Dynamics in Antiferromagnets

Published in ProQuest Dissertations Theses Global, 2022

My thesis experimentally investigates the electrical detection and control of Néel order in insulating antiferromagnetic thin films, like 𝛼−Fe₂O₃ and NiO, aiming to advance antiferromagnetic materials application in high-speed spintronic devices.

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Third harmonic characterization of antiferromagnetic heterostructures

Published in Nature Communications, 2022

This study uses harmonic measurements in Pt/α-Fe₂O₃ bilayers to identify third-harmonic signals from damping-like torque and thermally-induced effects, offering a new approach to understanding current-induced switching in antiferromagnets for spintronic applications.

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Quantifying Spin-Orbit Torques in Antiferromagnet/Heavy Metal Heterostructures

Published in Physical Review Letters, 2022

This study characterizes spin-orbit torques (SOTs) at antiferromagnet-heavy-metal (AFM-HM) interfaces, revealing that fieldlike torques dominate over dampinglike ones in 𝛼−Fe₂O₃/Pt heterostructures, with implications for spin current manipulation in insulating AFMs.

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Zero-Field Nucleation and Fast Motion of Skyrmions Induced by Nanosecond Current Pulses in a Ferrimagnetic Thin Film

Published in Nano Letters, 2022

This study demonstrates that ferrimagnetic Pt/CoGd/(W or Ta) films enable fast skyrmion motion with minimal deflection, reducing information loss risks and positioning ferrimagnets as promising materials for high-speed, stable skyrmion-based memory devices.

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Ultra-thin lithium aluminate spinel ferrite films with perpendicular magnetic anisotropy and low damping

Published in Nature Communications, 2023

This study introduces ultra-thin Li₀.₅Al₁.₀Fe₁.₅O₄ (LAFO) films with perpendicular magnetic anisotropy, low damping, and no dead layers, achieving efficient magnetization switching and high spin-orbit torque efficiency, thus advancing spin-based electronics.

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