Tdgl equation piezo electric12/14/2023 By applying forces on nanoparticles bound to the surface of cortical neurons we were able to control calcium signaling locally within neural networks and bias the direction of neural network growth. We have used this platform to perform quantitative equilibrium separations of cells based on surface expression by labeling with superparamagnetic nanoparticles as well as select mutant magnetotactic bacteria that produce increased numbers of magnetic nanoparticles. Magnetizing the micro-magnetic elements with a permanent magnet generates large magnetic potential minima that rapidly and precisely apply magnetic forces on nanoparticles attached to the surface of or inside of cells. I will discuss the core of this platform - a micromagnetic substrate composed of: i) electroplated soft magnetic (NixFey) elements, ii) a biocompatible, planarized resin layer, and iii) lithographically patterned micro-magnet arrays. My lab is developing a set of tools to de-amplify macroscale motions and forces to nanoscale perturbations to separate and locally stimulate cells. Professor and Graduate Vice Chair, UCLA Department of Bioengineeringĭeveloping the next generation of tools to automate cell biology research and quantitatively separate the most active cells for cell therapies requires new approaches to interfacing at the cellular and sub-cellular scale. We incorporated Ce- and Bi-substituted YIG into integrated magnetooptical isolators to control the flow of light in photonic integrated circuits. Iron garnets also exhibit magnetooptical activity and high transparency in the infrared, which makes them useful non-reciprocal materials at communications wavelengths. RE garnet/Pt bilayers exhibit a Dzyaloshinskii-Moriya interaction and 10 nm magnetic domain sizes making them suitable systems for skyrmion generation. RE garnet/Pt bilayers exhibit efficient spin transmission across the garnet/Pt interface, and we achieved bidirectional switching of the magnetization of TmIG at room temperature via domain wall translation at velocities exceeding 800 m/s, faster than all-metal systems. We demonstrate robust PMA in films of thulium, europium and terbium iron garnet (TmIG, EuIG and TbIG) with high structural quality down to a thickness of 5.6 nm, about 5 unit cells. Epitaxial rare earth (RE) garnet films are both magnetic and magnetoelastic, and their properties can be manipulated by choice of composition and substrate lattice mismatch, including making films with perpendicular magnetic anisotropy (PMA) and obtaining a room temperature compensation temperature. Yttrium iron garnet in particular is an excellent insulator with low Gilbert damping and a Néel temperature well above room temperature, and has been incorporated into heterostructures that exhibit a plethora of spintronic and magnonic phenomena including spin pumping, spin Seebeck, proximity effects and spin wave propagation. Professor Caroline Ross - Associate Head of the Department of Materials Science and Engineering, Massachusetts Institute of Technologyįerromagnetic insulator thin films have emerged as an important component of magnonic, spintronic and magnetooptical devices. Iron Garnets: Enabling Materials for Magnonics, Photonics, and Spintronics
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