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Facile Development of Iron-Platinum Nanoparticles to Harness Multifunctionality in Single Entity

Acta Metallurgica Sinica(English Letters) 2016年第12期29卷 1098-1106页

作者： Madhulekha Gogoi Komanduri S. Varadarajan Anant Bahadur Patel pritam deb Department of Physics Tezpur University (Central University) Tezpur Assam 784028 India NMR Microimaging and Spectroscopy Centre for Cellularand Molecular Biology Habsiguda Hyderabad 500007 India Department of Chemistry IIT GuwahatiNorth Guwahati Assam 781039 India

Engineered magnetic nanosystems exhibit attractive options for implementing unique diagnostic options and therapeutic solutions in biomedical applications. Here we report a facile, thermo-free and aqueous synthetic method to prepare ascorbic acid-stabilized iron-platinum nanoparticles. The effects of reducing agent, pH and sequence of precursor addition are investigated, and optimized reaction condition is identified to obtain a unique iron-platinum （Pt-FePt） nanosystems. The multifunctionality of the developed nanosystem has been realized by catalytic efficiency of platinum for therapeutic application and superparamagnetic property of FePt for magnetic resonance imaging contrast enhancement. Moreover, the multifunctional imaging and therapeutic activities have been achieved at physiological pH. The developed multifunctional nanoparticles are monodisperse with uniform morphology as well as stable in solution and non-toxic.

关键词： Multifunctional Superparamagnetic Magnetic resonance imaging (MRI) Therapeutic

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Room-temperature tunable tunneling magnetoresistance in Fe_(3)GaTe_(2)/WSe_(2)/Fe_(3)GaTe_(2) van der Waals heterostructures

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InfoMat 2024年第6期6卷 88-94页

作者： Haiyang Pan Anil Kumar Singh Chusheng Zhang Xueqi Hu Jiayu Shi Liheng An Naizhou Wang Ruihuan Duan Zheng Liu Stuart S.P.Parkin pritam deb Weibo Gao Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingaporeSingapore School of Materials Science and Engineering Yancheng Institute of TechnologyYanchengthe People's Republic of China Department of Physics Tezpur University(Central University)TezpurIndia School of Materials Science and Engineering Nanyang Technological UniversitySingaporeSingapore Max Planck Institute of Microstructure Physics Halle(Saale)Germany The Photonics Institute and Centre for Disruptive Photonic Technologies Nanyang Technological UniversitySingaporeSingapore Center for Quantum Technologies National University of SingaporeSingaporeSingapore

The exceptional properties of two-dimensional(2D)magnet materials present a novel approach to fabricate functional magnetic tunnel junctions(MTJ)by constructing full van der Waals(vdW)heterostructures with atomically sharp and clean *** exploration of vdW MTJ devices with high working temperature and adjustable functionalities holds great potential for advancing the application of 2D materials in magnetic sensing and data ***,we report the observation of highly tunable room-temperature tunneling magnetoresistance through electronic means in a full vdW Fe_(3)GaTe_(2)/WSe_(2)/Fe_(3)GaTe_(2) *** spin valve effect of the MTJ can be detected even with the current below 1 nA,both at low and room temperatures,yielding a tunneling magnetoresistance(TMR)of 340%at 2 K and 50%at 300 K,***,the magnitude and sign of TMR can be modulated by a DC bias current,even at room temperature,a capability that was previously unrealized in full vdW *** tunable TMR arises from the contribution of energy-dependent localized spin states in the metallic ferromagnet Fe_(3)GaTe_(2) during tunnel transport when a finite electrical bias is *** work offers a new perspective for designing and exploring room-temperature tunable spintronic devices based on vdW magnet heterostructures.

关键词： Fe_(3)GaTe_(2) magnetic tunnel junction room temperature tunneling magnetoresistance van der Waals heterostructure

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