Article
Materials Science, Multidisciplinary
Ricci Erlandsen, Rasmus Bjork, Lior Kornblum, Nini Pryds, Dennis V. Christensen
Summary: Researchers have achieved high-sensitivity detection of weak magnetic fields by breaking the symmetry of devices, and found that these asymmetric structures also have other excellent magnetoresistive properties. This provides new insights for the design of magnetoresistive sensors with unparalleled performance.
Article
Physics, Applied
Mahmoud Rasly, Tomoya Nakatani, Jiangnan Li, Hossein Sepehri-Amin, Hiroaki Sukegawa, Yuya Sakuraba
Summary: In this study, amorphous CoFeBTa (CFBT) was investigated as a soft magnetic layer for the free layer (FL) of magnetic tunnel junctions, leading to linear resistance-magnetic field (R-H) response curves with low hysteresis. The highest TMR ratio and sensitivity were achieved with a specific CFBT/Ta/CoFeB FL composition. The devices showed superior detectivity (D) for magnetic field sensing compared to previously reported TMR sensors with NiFe soft magnetic layers.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Multidisciplinary Sciences
Seungchul Jung, Hyungwoo Lee, Sungmeen Myung, Hyunsoo Kim, Seung Keun Yoon, Soon-Wan Kwon, Yongmin Ju, Minje Kim, Wooseok Yi, Shinhee Han, Baeseong Kwon, Boyoung Seo, Kilho Lee, Gwan-Hyeob Koh, Kangho Lee, Yoonjong Song, Changkyu Choi, Donhee Ham, Sang Joon Kim
Summary: This paper presents a 64 x 64 crossbar array based on MRAM cells that overcomes the low-resistance issue and successfully implements analogue multiply-accumulate operations in artificial neural networks. The researchers achieved high classification accuracy and face detection using this array for tasks involving 10,000 digits.
Article
Chemistry, Multidisciplinary
Roma Wirecka, Krzysztof Mackosz, Antoni Zywczak, Mateusz Marek Marzec, Szczepan Zapotoczny, Andrzej Bernasik
Summary: In this study, six nanocomposites based on different magnetic nanoparticles and a conducting polymer, poly(3-hexylthiophene-2,5-diyl) (P3HT), were synthesized. The nanoparticles were coated with either squalene and dodecanoic acid or P3HT, and the cores of the nanoparticles were made of nickel ferrite, cobalt ferrite, or magnetite. The average diameters of all synthesized nanoparticles were below 10 nm, with varying magnetic saturation at 300 K. The impact of different magnetic fillers on the conducting properties and the influence of the shell on the final electromagnetic properties of the nanocomposite were explored.
Article
Engineering, Electrical & Electronic
Clemens Muehlenhoff, Michal Krupinski, Arkadiusz Zarzycki, Manfred Albrecht
Summary: In this study, the magnetotransport properties of Co/Pt based perpendicular synthetic antiferromagnetic (p-SAF) structures with Ru interlayers were investigated. The number of Co/Pt multilayer (ML) stacks and Ru interlayers in the p-SAF structures were varied to examine changes in their magnetoresistive effects. The alignment of magnetization directions of the MLs in the ML/Ru/ML stacks of the p-SAF generated a giant magnetoresistance effect (GMR), while the anisotropic magnetoresistance effect (AMR) at each ML further influenced the resistance of the system. The study results have important implications for understanding and application of magnetoresistive effects.
IEEE SENSORS JOURNAL
(2022)
Article
Nanoscience & Nanotechnology
Svenja Willing, Kai Schlage, Lars Bocklage, Mohammad Mehdi Ramin Moayed, Tatiana Gurieva, Guido Meier, Ralf Roehlsberger
Summary: This study explores the application of oblique-incidence deposition (OID) technology to introduce anisotropy in the magnetic properties of thin films, aiming to control and optimize the magnetic response of TMR devices. Using OID technology not only eliminates the need for additional magnetic contact materials, but also enables targeted control of shape anisotropy, providing new possibilities for TMR device design.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Wenhao Xie, Feichong Yao, Hongbo Gu, Ai Du, Qin Lei, Nithesh Naik, Zhanhu Guo
Summary: A novel three-dimensional nanocomposite aerogel with outstanding magnetoresistance and piezoresistance was manufactured by surrounding magnetic reduced graphene oxide (rGO/Fe3O4) aerogel with in-situ polymerized polyaniline nanoarrays (PANI NAs). The aerogel exhibited excellent mechanical strength, preserved its porous structure, and showed a promising performance in terms of recovery ratio, piezoresistive performance, and magnetoresistance.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Davud Guseinov, Alexey N. Mikhaylov, Yuriy Pershin
Summary: In this paper, the instantaneous response of resistors with memory is classified into three types: linear (L), separable nonlinear (SN), and non-separable nonlinear (NSN). A particular model of an NSN-type memristive device is introduced to demonstrate the rich dynamics in the memristor-capacitor circuit under sinusoidal voltage. The simulations reveal double period oscillations, multiple period oscillations, and chaotic oscillations. The comparison with L-type and SN-type memristive devices emphasizes the importance of the NSN-type response in achieving complex dynamics in the first-order memristive device circuit.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2022)
Article
Instruments & Instrumentation
Xiaolin Li, Jiangtao Zhang, Luyan Shen, Liming Qin, Qiang Fu, Youyi Sun, Yaqing Liu
Summary: A novel magnetoresistance material based on MRF was developed by dispersing CIP into MIL, showing excellent magnetoresistance characteristics and displacement sensing capabilities.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Engineering, Electrical & Electronic
Sofia Abrunhosa, Ian Gibb, Rita Macedo, Emrys Williams, Nathalie Muller, Paulo P. Freitas, Susana Cardoso
Summary: Information encoding in barcodes using magnetic-based technology allows data to be read underneath non-transparent surfaces, which has potential applications in secure labeling and recyclable packaging. By replacing traditional inductive heads with tunnel magnetoresistive sensors, the limitations of current magnetic reading heads can be overcome, enabling deeper information reading. Experimental results demonstrate that this device can read barcodes at depths of at least 1 mm and resolve structures as thin as 200 μm when in contact.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Materials Science, Multidisciplinary
Bor-Yuan Jiang, Kunliang Zhang, Takahiko Machita, Wenyu Chen, Moris Dovek
Summary: Hard Disk Drive read heads switched from GMR to TMR technology to improve signal-to-noise ratio for advanced linear densities. The use of crystalline MgO barriers matched to BCC magnetic layers increased the MR ratios. Enhanced side shielding and reduced shield spacing further improved the track and linear density capabilities of TMR heads. Introduction of two-dimensional recording heads boosted head SNR, but overcoming spin torque noise remains a challenge. Magnetic thermal noise can only be overcome by increasing the moment of the free layer, potentially setting the final density achievable by TMR heads.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Physics, Applied
Mikhail Ved, Yuri Danilov, Polina Demina, Mikhail Dorokhin, Yuri Dudin, Valentina Kotomina, Alexey Kudrin, Yuri Kuznetsov, Anton Zdoroveyshchev, Daniil Zdoroveyshchev
Summary: A magnetic switch with integrated magnetoresistive element and light-emitting diode has been developed for controlling electron vs hole current ratio, triggering electroluminescence, and completely switching off the LED by changing the resistance state. The effect is dependent on the operating current and can have multiple applications like high-speed magnetic field sensor, magnetic field visualizer, or optical device for reading MRAM.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Vitalii Shtender, Valerie Paul-Boncour, Roman Denys, Daniel Hedlund, Peter Svedlindh, Ihor Zavaliy
Summary: R2MgCo9 (R = Pr, Nd, Tb and Y) compounds and their hydrides were synthesized and characterized. The crystal structures and magnetic properties were systematically studied, revealing specific structural and magnetic behaviors.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Chemistry, Multidisciplinary
Feriel Rekhroukh, Linxing Zhang, Richard Y. Kong, Andrew J. P. White, Mark R. Crimmin
Summary: This study reports the reactions of cyclopropenes with compounds containing Mg-Mg bonds, demonstrating a concerted and stereoselective mechanism of 1,2-dimagnesiation. The findings shed new light on the stereochemistry of reactions involving magnesium reagents.
CHEMICAL COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Jiaming Liu, Mengmeng Guan, Yiwei Xu, Shuang Zhao, Wei Su, Cuiling Zhang, Zhiguang Wang, Xiaohui Zhang, Zhongqiang Hu, Zhuangde Jiang, Ming Liu
Summary: In this work, a new weak-current sensor module based on the tunneling magnetoresistive (TMR) effect was developed, which can accurately measure microamperes-level weak electric currents. The sensor has low noise, high sensitivity, and wide bandwidth, and performs well in both DC and AC current measurements. This sensor has significant potential for applications in industrial fields such as smart grids and green energy.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
