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DTSTART;TZID=America/New_York:20210617T100000
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DTSTAMP:20260603T230317
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SUMMARY:PhD Dissertation Defense: Huaihao Chen
DESCRIPTION:PhD Dissertation Defense: Integrated RF Devices Based on Magnetoelectric Coupling \nHuaihao Chen \nLocation: Zoom Meeting \nAbstract: The magnetoelectric (ME) coupling effect is a coupling behavior between the magnetic properties and electric properties in a single-phase crystal or a composite structure. At present\, ME composite is more widely used in practical application than the single-phase crystal due to the larger coupling coefficient and higher working temperature. Based on the coupling direction\, there are two types of ME coupling: the direct coupling by using magnetic field to control the electric polarization; the converse coupling by using electric field to control the magnetization. With the strong coupling effect and the low power consumption\, ME coupling becomes more and more attractive in RF devices design\, including magnetic sensor\, ME memory\, energy harvester and so on.\nIn this dissertation\, the integrated inductor and ME antenna based on ME coupling are reported\, including the design\, simulation\, fabrication and test of the devices. The performances\, advantages and issues of these devices are discussed\, and some improvements are applied for a better performance.\nThe first part of this thesis is the integrated high-Q and RF tunable inductors. In this part\, the 1-D laminated iron core inductor model\, choosing of magnetic material for the inductor core and the tuning principle based on converse ME coupling is explained firstly. Then\, the fabrication process flow is described. The practical high-Q inductor shows a constant inductance of ~1.4 nH in a wide frequency range from DC to 3 GHz\, with a peak Q-factor of 32.7\, after magnetic annealing. By attaching a PMN-PT slab to the device\, a tunable inductor is realized. Inductance tunabilites are achieved under both magnetic field (69.2%) and electric field (191%)\, which is higher than most of the reported inductors.\nThe second part is the design of ME antenna for biomedical implants. FeGaB/AlN heterostructure is chosen as the ME resonator of the antenna. The operation frequency is the acoustic resonance\, decided by the width of the resonator. This ME antenna has a ~1000 times smaller volume than conventional antennas\, due to the smaller wavelength of acoustic wave than electromagnetic wave. After fabrication\, the measured S11 resonance peak matches with the simulation\, and the antenna gain of -37.1 dBi is calculated by a gain comparison method. The modified Butterworth-Van Dyke (mBVD) model is used to calculate the Q-factor (114) and electromechanical coupling coefficient (kt2\, 0.98%). The radiation pattern and polarization are measured\, proving that this ME antenna performs as a magnetic dipole. Finally\, the input impedance matching is optimized with array structure. The third part is the performance improvement of FeGaB thin film by minimizing the mechanical stress from the film deposition\, by controlling the deposition pressure and magnetic annealing. The film deposited under 2 mTorr pressure shows the lowest stress and best magnetic properties of coercive field\, saturation magnetization\, magnetic damping and magnetostriction. And the magnetic annealing shows an improvement on the FeGaB film. This research helps to improve the performance of devices based on FeGaB thin film.
URL:https://coe.northeastern.edu/event/phd-dissertation-defense-huaihao-chen/
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DTSTART;TZID=America/New_York:20210617T120000
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DTSTAMP:20260603T230317
CREATED:20210524T182548Z
LAST-MODIFIED:20210524T182548Z
UID:26075-1623931200-1623936600@coe.northeastern.edu
SUMMARY:Pre-Launch Briefing: Preparing to Spin Out A Hard-Tech Startup
DESCRIPTION:You’ve created something interesting and exciting in the lab\, published a few papers and maybe filed some patents and are wondering what to do next.\nMike Fuerstman and Becky Wilson of Rhapsody Venture Partners will walk through questions you should be asking and answering about your technology and your objectives to figure out the best path forward – whether it’s a startup or something else entirely.\nThe team will provide insights based on Rhapsody’s approach with its portfolio companies in hard tech along with concrete examples and best practices.
URL:https://coe.northeastern.edu/event/pre-launch-briefing-preparing-to-spin-out-a-hard-tech-startup/
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