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“Transparent Magnetoelectric Materials for Advanced Invisible Electronic Applications”
R. Polícia, A.C. Lima, N. Pereira, E. Calle, M. Vázquez, S. Lanceros-Mendez and P. Martins
Adv. Electron. Mater. 2019, 1900280; DOI: 10.1002/aelm.201900280
The need for flexible and transparent smart materials is leading to substantial advances in principles, material combinations, and technologies. Particularly, the development of optically transparent magnetoelectric (ME) materials will open the range of applications to new directions such as transparent sensors, touch display panels, multifunctional flat panel displays, and optical magnetic coatings. In this work, a flexible and transparent ME composite is made of magnetostrictive Fe72.5Si12.5B15 microwires and piezoelectric poly(vinylidene fluoride-trifluoroethylene). The high magnetostriction of Fe72.5Si12.5B15 (35 ppm) enables superior ME voltage response (65 mV cm−1 Oe−1) obtained at the critical longitudinal magnetic field equating the transverse anisotropy (14500 A m−1) on the external shell of the microwire memory devices.
Left) Photographs of the composite placed on a written page, with (TOP) and without (DOWN) the PEDOT conductive layers, serving as electrodes; Right) Optical transmittance of the composites measured from 350 to 700 nm.
This paper derives from the collaboration between our GNMP team with the Departamento de Física, Universidade do Minho, Braga, Portugal.
On 28th and 29th we hold the kickoff meeting of the iLINK0052 project on “Nanorobots and Magnetic sensors based on Nanowires”. This enriching and discussion full meeting was attended by Dr. Olga Kazakova (NPL, Teddington, UK), Ass. Prof. Jürgen Kosel (KAUST, Saudi Arabia), Ass. Prof. Dieter Suess (University of Vienna), Dr. Xiangzhong Chen (ETH, Zurich), Dr. Christoph Vogler (University of Vienna) apart from staff members of ICMM/CSIC Manuel Vazquez, Agustina Asenjo, Oksana Chubykalo-Fesenko, Cristina Bran, Rafael Perez, David Navas, Alfredo Jacas, and Prof. Laura H. Lewis from Northeastern University, Boston.
The traditional summer excursion of the group took place June 26th to visit Sigüenza, the old Castilian city which origin goes back to the Celtiberian Segontia. After the 2 hours walk by the pines and under a suffocating sun to the nearby Natural Park, we had a comforting lunch. It was followed by the cultural visit to the medieval Castle and the gothic Cathedral that hosts the famous tomb of the Doncel.
“Geometrically designed domain wall trap in tri-segmented nickel magnetic nanowires for spintronics devices”
Farzad Nasirpouri, Seyed-Majid Peighambari-Sattari, Cristina Bran, Ester M. Palmero, Eider Berganza Eguiarte, Manuel Vazquez, Aristotelis Patsopoulos and Dimitris Kechrakos, Scientific Reports (2019) 9:9010 | https://doi.org/10.1038/s41598-019-45553-w
“Domain wall traps” have been engineered diameter-modulated (DM) cylindrical magnetic nanowires (NWs). A systematic study on the magnetization behavior, domain wall structure and its nucleation/propagation in tri-segmented diameter-modulated Ni nanowires was performed to investigate the magnetization reversal as function of segment geometry. Two distinct geometries include: dumbbell-type (type I) and rolling pin-type (type II). Based on experimental and theoretical simulations, it was evidenced that the wide-narrow junctions create trap sites for domain walls where the narrow segment restricts their motion. This type of geometrically engineered nanowires exhibit potential efficiency for future novel spintronic devices in particular when assembled in arrays as a practical 2D memory devices.
  
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