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Exchange bias (EB) refers to the magnetic hysteresis loop shifting away from zero field due to the exchange interaction between a ferromagnet (FM) and an antiferromagnet (AF) across their common interface [1]. Nowadays the FM/AF EB structure with in-plane anisotropy has been widely adopted in hard disk drives and magnetic random access memories based on spin valves and magnetic tunnel junctions (MTJs)...
Recently, the exchange bias (EB) phenomenon in the ferromagnet/antiferromagnet (FM/AFM) bilayer and its inborn instability effect, i.e., training effect [1], have attracted much attention for its great technological importance in spintronic devices. Usually, the study of training effect is performed by continuously recording the exchange field (HE) and the coercivity (HC) after measuring an entire...
One of the key issues for the practical application of the current-induced spintronic devices is of reducing the critical current (Ic0) for the current-induced magnetization reversal. The perpendicular magnetic anisotropy (PMA) and high spin polarization of the ferromagnetic layer are theoretically predicted and experimental verified to be useful for reducing the critical current of the magnetic reversal...
Cu(Mn) alloy seed BEOL studies revealed fundamental insights into Mn segregation and EM enhancement. We found a metallic-state Mn-rich Cu layer under the MnOx layer at the Cu/SiCNH cap interface, and correlated this metallic layer with additional EM enhancement. A carbonyl-based CVD-Co liner film consumed Mn, reducing its segregation and EM benefit, suggesting O-free Co liner films are strategic for...
Hydrogenated amorphous silicon nitride (a-SiNx: H) films were prepared by plasma enhanced chemical vapor deposition (PECVD) with silane and ammonia. After different temperature annealing treatments the bonding configuration and photoluminescence (PL) mechanisms of the samples were studied by Fourier-transform infrared spectroscopy and Fluorescence spectrometer. With the increase of annealing temperature...
We report a thin PVDF-TrFE (polyvinyledenedifluoride-tetrafluoroethylene) copolymer film pressure sensor, fabricated using the standard lithography process for cost-effective batch process, film uniformity, and high resolution of polymer patterning. PVDF-TrFE copolymer, a semi-crystalline material, was spin-coated into thin films (1 μm thick or less) to tap the near β-phase formation. Such thin films,...
Polytetrafluoroethylene (PTFE) films with a void structure are prepared by the sintering process. Such void PTFE films are piezoelectric after proper corona charging. The quasi-static piezoelectric d33 coefficients up to 250 pC/N are obtained. Pre-ageing treatment is an effective method to further improve the thermal stability. For the samples with pre-ageing treatment, the the d33 coefficients are...
In the present study, an improved process for preparing thermally stable laminated sandwiches of non-porous fluoroethylenepropylene (FEP) and porous polytetrafluoroethylene (PTFE) films is described. Also, the thermal stability of the d33-coefficients for such fluorocarbon films is discussed.
Cellular polymer films have an enhanced charge storage capability, since the charge drift across the film is hindered by the presence of voids. Furthermore, modulating the morphology of those cellular polymer structures, very high piezoelectric activities can be obtained. In this work, polypropylene (PP) and polyetherimide (PEI) cellular films were produced using novel methods and their morphology,...
So far, linear polypropylene (PP) foam is the most extensively investigated ferroelectret. In the present studies, cross-linked PP (XPP) foam sheets are modified by a hot-press process, and then corona charged to be piezoelectric. Thereafter their piezoelectric activities are investigated.
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