IEEE Magnetics Letters最新文献_第5页

Performance Simulation of Multiferroic Neuron Device Driven by an Inclined Monopulse Clock 倾斜单脉冲时钟驱动多铁神经元器件的性能仿真

IF 1.2 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2023-06-19 DOI: 10.1109/LMAG.2023.3287396

Shuqing Dou;Xiaokuo Yang;Jiahui Yuan;Yongshun Xia;Xin Bai;Huanqing Cui;Bo Wei

{"title":"Performance Simulation of Multiferroic Neuron Device Driven by an Inclined Monopulse Clock","authors":"Shuqing Dou;Xiaokuo Yang;Jiahui Yuan;Yongshun Xia;Xin Bai;Huanqing Cui;Bo Wei","doi":"10.1109/LMAG.2023.3287396","DOIUrl":"https://doi.org/10.1109/LMAG.2023.3287396","url":null,"abstract":"Multiferroic nanomagnet neuron devices have the advantages of ultralow power consumption and high integration, which give them promising applications in neuromorphic computing. In this letter, a multiferroic nanomagnet neuron device driven by an inclined monopulse clock is modeled. The strain field direction of the device is at an angle to the nanomagnet's long axis, and the nanomagnet's magnetic moment can be driven to switch randomly 0°/180° by applying a pulse voltage of 0.1 ns pulse width only, thus realizing artificial neuron functions. The numerical model of the neuron device is established based on the Landau–Lifshitz–Gilbert equation. The numerical simulation results indicate that the neuron device can complete high-speed neuromorphic computation with tiny energy use (∼2.65 aJ). Additionally, a three-layer artificial neural network based on neuron devices is built. The simulation results demonstrate that the network can recognize handwritten digits in the Modified National Institute of Standards and Technology (MNIST) dataset at a rate of more than 98% and has a high tolerance for process error. The device has significant advantages over conventional spin neuron devices, including a simple structure, ultralow energy consumption, fast computation capabilities, and a wide fabrication process error tolerance range. The study results in this letter offer crucial theoretical recommendations for applying strain magneto-electronic devices in neuromorphic computing.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"14 ","pages":"1-5"},"PeriodicalIF":1.2,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67762071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In Vivo Measurement of Cerebral SPIO Concentration in Nonhuman Primate Using Magnetic Particle Imaging Detector 用磁粉成像检测器在体测量非人类灵长类动物脑SPIO浓度

IF 1.2 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2023-06-01 DOI: 10.1109/LMAG.2023.3281933

Hui Hui;Jiaojiao Liu;Hui Zhang;Jing Zhong;Jie He;Bo Zhang;Haoran Zhang;Qin Li;Hongjun Li;Jie Tian

{"title":"In Vivo Measurement of Cerebral SPIO Concentration in Nonhuman Primate Using Magnetic Particle Imaging Detector","authors":"Hui Hui;Jiaojiao Liu;Hui Zhang;Jing Zhong;Jie He;Bo Zhang;Haoran Zhang;Qin Li;Hongjun Li;Jie Tian","doi":"10.1109/LMAG.2023.3281933","DOIUrl":"https://doi.org/10.1109/LMAG.2023.3281933","url":null,"abstract":"The purpose of this study is to develop a magnetic particle imaging (MPI) technique to directly measure time-varied cerebral superparamagnetic iron oxide nanoparticle (SPIO) concentration in rhesus macaques. A hand-held MPI detector was developed to monitor MPI signal changes at the third harmonics of the drive frequency in resting-state nonhuman primates. Phantom experiments were first performed to determine the sensitivity limits of the detector as a function of distance from the detector and SPIO concentration. The measured sensitivity profile was then used to reveal the most sensitive region of the detector. MPI detection was continuously performed to monitor MPI signal changes after two bolus injections of SPIOs in the rhesus macaque. We successfully developed a hand-held MPI to detect cerebral SPIO concentration changes in a living nonhuman primate. The detection limit of the MPI detector is about 125 ng iron. We reported on the \u0000<italic>in vivo\u0000 measurement of cerebral SPIO concentration changes in rhesus macaque using a hand-held MPI detector. \u0000<italic>In vivo\u0000 experiments showed the feasibility of the detector to sensitively measure MPI signals in a nonhuman primate brain.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"14 ","pages":"1-5"},"PeriodicalIF":1.2,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/5165412/10018138/10141661.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67762116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Unidirectional Pore Formation in Resins Using a Magnetic-Nanoparticle-Chain Template 利用磁性纳米粒子链模板在树脂中形成单向孔

IF 1.2 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2023-04-20 DOI: 10.1109/LMAG.2023.3268851

Atsuki Kobayashi;Kohya Sano;Junpei Sakurai;Hosei Nagano;Seiichi Hata;Chiemi Oka

{"title":"Unidirectional Pore Formation in Resins Using a Magnetic-Nanoparticle-Chain Template","authors":"Atsuki Kobayashi;Kohya Sano;Junpei Sakurai;Hosei Nagano;Seiichi Hata;Chiemi Oka","doi":"10.1109/LMAG.2023.3268851","DOIUrl":"https://doi.org/10.1109/LMAG.2023.3268851","url":null,"abstract":"We present a novel manufacturing technique for generating unidirectional pores in ultraviolet (UV)-curable resins using self-assembled magnetic nanoparticles (MNPs) with chain-like structures. The method utilizes two templation mechanisms for pore formation: the UV-masking effect of the MNP chains and the physical presence of MNP chains themselves. Fe\u00003\u0000O\u00004\u0000 nanoparticles and PAK-01 were used as the template and UV-curable resin, respectively. Unidirectional pores formed only when resin/MNP mixtures were cured under a strong externally applied magnetic field. Water absorption tests indicated that some of the unidirectional pores were through-hole-type pores. The pores were cylindrical with an ellipsoidal cross-section. When the UV irradiation angle (\u0000<italic>θ\u0000) was 30°, the long and short diameters of the pores were approximately 9 and 8 \u0000<inline-formula><tex-math>$mu$</tex-math></inline-formula>\u0000m, respectively, before MNP removal, and 12 and 8 \u0000<inline-formula><tex-math>$mu$</tex-math></inline-formula>\u0000m, respectively, after removal. After MNP removal, the ellipticity of the pores in the samples increased from 1.5 to 2.4 with the increase in \u0000<italic>θ\u0000 because of the increased UV-masking effect of the MNP chains.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"14 ","pages":"1-5"},"PeriodicalIF":1.2,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67763011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Magnetic Field Enhancement of Water Evaporation in Confined Spaces 密闭空间中水蒸发的磁场增强

IF 1.2 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2023-04-04 DOI: 10.1109/LMAG.2023.3262976

Sruthy Poulose;Yara Alvarez-Braña;Lourdes Basabel-Desmonts;Fernando Benito-Lopez;John Michael David Coey

{"title":"Magnetic Field Enhancement of Water Evaporation in Confined Spaces","authors":"Sruthy Poulose;Yara Alvarez-Braña;Lourdes Basabel-Desmonts;Fernando Benito-Lopez;John Michael David Coey","doi":"10.1109/LMAG.2023.3262976","DOIUrl":"https://doi.org/10.1109/LMAG.2023.3262976","url":null,"abstract":"Water is studied in confined environments where it evaporates into its own vapor. Simultaneous experiments are conducted for 0.4–0.5 µL droplets confined at the center of 54 mm long microchannels with a cross section of 0.38 mm\u00002\u0000 in the presence and absence of a 300 mT magnetic field. Results are compared with those for water in half-filled 100 mL beakers. The magnetic enhancement of the evaporation rate is much greater in the microchannels, where effects range up to 140% even though the air is saturated with water vapor, as compared to 12 ± 7% in a 500 mT field in the beakers. The average steady state, no-field evaporation rate of 0.13 kg\u0000<inline-formula><tex-math>$cdot$</tex-math></inline-formula>\u0000m\u0000−2\u0000<inline-formula><tex-math>$cdot$</tex-math></inline-formula>\u0000h\u0000−1\u0000 in the microchannels is roughly double that in the beakers, but less than the value expected at an open surface in still air. The magnetic enhancement is analyzed in terms of the \u0000<italic>ortho\u0000 and \u0000<italic>para\u0000 nuclear isomers of water vapor, which behave as independent gasses. The \u0000<italic>ortho:para\u0000 ratio in fresh vapor is close to 2:3, and quite different from the 3:1 equilibrium ratio in ambient air. Evaporation is increased by the gradient of the applied magnetic field, which dephases the Larmor precession of the two proton spins of hydrogen in a water molecule and tends to equalize the isomeric populations in the vapor, thereby increasing the evaporation rate.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"14 ","pages":"1-5"},"PeriodicalIF":1.2,"publicationDate":"2023-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/5165412/10018138/10092455.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67763008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Magnetic Relaxation of Superparamagnetic Fe Oxide Particles Studied With Mössbauer Spectroscopy 用穆斯堡尔谱研究超顺磁性氧化铁粒子的磁弛豫

IF 1.2 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2023-04-03 DOI: 10.1109/LMAG.2023.3264115

Eiji Kita;Reisho Onodera;Mikio Kishimoto;Hideto Yanagihara

引用次数: 0

The Impact of Sample Insulation on Estimating the Heating Power of Magnetic Nanoparticles by AC Calorimetry 样品绝缘对交流量热法估算磁性纳米粒子加热功率的影响

IF 1.2 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2023-03-30 DOI: 10.1109/LMAG.2023.3279778

Lise G. Hanson;Bianca L. Hansen;Thomas Veile;Mathias Zambach;Niels B. Christensen;Cathrine Frandsen

引用次数: 1

Preparation of Temperature-Sensitive Rare-Earth–Iron Alloy Fine Particles Using Mechanical Alloying and Sintering 用机械合金化和烧结法制备对温度敏感的稀土-铁合金细颗粒

IF 1.2 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2023-03-29 DOI: 10.1109/LMAG.2023.3281158

Jiatong Pan;Jianfei Shentu;Chunlin He;Deqian Zeng;Feng Gao;Gjergj Dodbiba;Toyohisa Fujita

{"title":"Preparation of Temperature-Sensitive Rare-Earth–Iron Alloy Fine Particles Using Mechanical Alloying and Sintering","authors":"Jiatong Pan;Jianfei Shentu;Chunlin He;Deqian Zeng;Feng Gao;Gjergj Dodbiba;Toyohisa Fujita","doi":"10.1109/LMAG.2023.3281158","DOIUrl":"https://doi.org/10.1109/LMAG.2023.3281158","url":null,"abstract":"Fine magnetic particles with high saturation magnetization and a large temperature-sensitive magnetization in the temperature range 300–400 K were prepared for use in temperature-sensitive magnetorheological fluids. Two methods, namely high-energy ball milling (HEBM) and sintering followed by HEBM to produce mechanochemical alloys, were used to produce R\u00002\u0000Fe\u000017\u0000 component particles. The prepared particles were submicrometer- to micrometer-sized and contained rare-earth–iron alloys and α-Fe phases. Among the prepared particles, Sm\u00002\u0000Fe\u000017\u0000 composition powder exhibited the highest temperature sensitivity of −0.02 A m\u00002\u0000 kg\u0000−1\u0000 K\u0000−1\u0000 at 400 K. Furthermore, powders with varying Fe and Sm composition ratios were prepared by sintering and ball milling. The powder prepared from the initial SmFe\u00005\u0000 composition exhibited the highest temperature sensitivity of −0.32 A m\u00002\u0000 kg\u0000−1\u0000 K\u0000−1\u0000 at 400 K and saturation magnetization was ∼90 A m\u00002\u0000 kg\u0000−1\u0000. The powder was composed of SmFe\u00005\u0000 and Sm\u00002\u0000Fe\u000017\u0000 in crystalline, α-Fe phase, and amorphous phase, as revealed by X-ray diffraction analysis and a scanning electron microscope, as well as high-resolution transmission electron microscopy with selected area electron diffraction.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"14 ","pages":"1-5"},"PeriodicalIF":1.2,"publicationDate":"2023-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67763005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Crystal Structure and Magnetic Properties of Hexagonal FeCo Nitrides Prepared Using Ammonia Gas Nitrification 氨气氮化制备六方氮化铁钴的晶体结构和磁性能

IF 1.2 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2023-03-27 DOI: 10.1109/LMAG.2023.3262452

Chihiro Kodaka;Mikio Kishimoto;Eiji Kita;Hideto Yanagihara

{"title":"Crystal Structure and Magnetic Properties of Hexagonal FeCo Nitrides Prepared Using Ammonia Gas Nitrification","authors":"Chihiro Kodaka;Mikio Kishimoto;Eiji Kita;Hideto Yanagihara","doi":"10.1109/LMAG.2023.3262452","DOIUrl":"https://doi.org/10.1109/LMAG.2023.3262452","url":null,"abstract":"Single-phase <inline-formula><tex-math notation=\"LaTeX\">$varepsilon$</tex-math></inline-formula>-(FeCo)<italic>x</italic>N compound particles with <inline-formula><tex-math notation=\"LaTeX\">$x$</tex-math></inline-formula> = 2.25–2.48 were synthesized using ammonia gas nitrification. The mass magnetization <inline-formula><tex-math notation=\"LaTeX\">$M$</tex-math></inline-formula> at 10 K under a magnetic field of 9 T was 77 A<inline-formula><tex-math notation=\"LaTeX\">$cdot$</tex-math></inline-formula>m<inline-formula><tex-math notation=\"LaTeX\">$^{2}$</tex-math></inline-formula>/kg, and Curie temperature <inline-formula><tex-math notation=\"LaTeX\">$T$</tex-math></inline-formula>C was 100 K for <inline-formula><tex-math notation=\"LaTeX\">$x$</tex-math></inline-formula> = 2.48. These values decreased with increasing nitrogen content. Compared with <inline-formula><tex-math notation=\"LaTeX\">$varepsilon$</tex-math></inline-formula>-Fe<italic>x</italic>N, (FeCo)<italic>x</italic>N had significantly lower <inline-formula><tex-math notation=\"LaTeX\">$M$</tex-math></inline-formula> and <inline-formula><tex-math notation=\"LaTeX\">$T$</tex-math></inline-formula>C values, even at comparable nitrogen content. Mössbauer spectroscopy suggests that the magnetic moment of Co decreases with increasing nitrogen content and disappears at approximately <inline-formula><tex-math notation=\"LaTeX\">$x$</tex-math></inline-formula> = 2.35, even at the lowest measurement temperature of <inline-formula><tex-math notation=\"LaTeX\">$T$</tex-math></inline-formula> = 3 K. Griffiths phaselike magnetic behavior was observed in the temperature dependence of magnetic susceptibility. The experimental results indicate that the Fe–Fe interaction may change from ferromagnetic to antiferromagnetic at <inline-formula><tex-math notation=\"LaTeX\">$x$</tex-math></inline-formula> = 2.25 when the nitrogen content is low.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"14 ","pages":"1-5"},"PeriodicalIF":1.2,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67762120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of Skyrmion Shuffling Chamber Stochasticity for Neuromorphic Computing Applications 用于神经形态计算应用的Skyrmion Shuffling腔Stocurity分析

IF 1.2 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2023-03-25 DOI: 10.1109/LMAG.2023.3280120

Zulfidin Khodzhaev;Emrah Turgut;Jean Anne C. Incorvia

引用次数: 0

A Deep Dive Into the Computational Fidelity of High-Variability Low Energy Barrier Magnet Technology for Accelerating Optimization and Bayesian Problems 高变率低能量势垒磁体加速优化技术的计算保真度与贝叶斯问题

IF 1.2 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2023-03-08 DOI: 10.1109/LMAG.2023.3274051

Md Golam Morshed;Samiran Ganguly;Avik W. Ghosh

引用次数: 1