IEEE Magnetics Letters最新文献_第8页

Influence of Dzyaloshinskii–Moriya and Dipole–Dipole Interactions on Spontaneous Magnetization Reversal Time of Finite-Length Co Chains on Pt(664) Surfaces Dzyaloshinskii–Moriya和偶极-偶极相互作用对Pt（664）表面有限长Co链自发磁化反转时间的影响

IF 1.2 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2022-12-05 DOI: 10.1109/LMAG.2022.3226656

Sergey V. Kolesnikov;Ekaterina S. Sapronova

引用次数: 0

Settling Time of Current-Tunable Probabilistic Bit's Distribution 电流可调概率比特分布的建立时间

IF 1.2 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2022-12-02 DOI: 10.1109/LMAG.2022.3226031

Brooke C. McGoldrick;Jonathan Z. Sun

引用次数: 1

Memory and Communication-in-Logic Using Vortex and Precessional Oscillations in a Magnetic Tunnel Junction 利用磁隧道结中的涡流和预专业振荡实现逻辑中的记忆和通信

IF 1.2 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2022-11-24 DOI: 10.1109/LMAG.2022.3224676

Sonal Shreya;Milad Zamani;Yaseer Rezaeiyan;Hamdam Ghanatian;Tim Böhnert;Alex S. Jenkins;Ricardo Ferreira;Hooman Farkhani;Farshad Moradi

{"title":"Memory and Communication-in-Logic Using Vortex and Precessional Oscillations in a Magnetic Tunnel Junction","authors":"Sonal Shreya;Milad Zamani;Yaseer Rezaeiyan;Hamdam Ghanatian;Tim Böhnert;Alex S. Jenkins;Ricardo Ferreira;Hooman Farkhani;Farshad Moradi","doi":"10.1109/LMAG.2022.3224676","DOIUrl":"https://doi.org/10.1109/LMAG.2022.3224676","url":null,"abstract":"Wearable and implantable devices (WIDs) come with several separate blocks such as preprocessing units, memory, and data transmission blocks. Hence, in this letter, we present the concept of memory and communication-in-logic (MCL) using a magnetic tunnel junction (MTJ). Here, MTJ is presented as a memory device as well as an oscillator for communication purposes. Vortex-based spin-torque nanooscillators (V-STNO) and precessional STNOs (P-STNO) generate a microwave frequency range (a few hundred MHz to a few GHz) wherein the frequency readout technique using the spin-torque diode is implemented for memory read function. In this work, a 300 nm nanodisk V-STNO generates 296 and 312 MHz frequency for two states of chirality (a characteristic of magnetic vortex), respectively. These different frequencies can be sensed for a bit “0”/ “1” read out through which the data from WIDs can be transmitted in a more energy- and area-efficient way. The output power emission is 3.22 and 1.76 µW for bit “1” and “0,” respectively, for V-STNO, which is three orders of magnitude larger than that of P-STNO. Finally, we demonstrate that V-STNO can transmit data up to 10 m in the air medium, which is much longer than P-STNO (0.24 m).","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"13 ","pages":"1-5"},"PeriodicalIF":1.2,"publicationDate":"2022-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67741587","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: 2

Effect of Buffer and Cap Layer on Thermally Stable Perpendicular Magnetic Anisotropy in Buffer/CoFeB/MgO/Cap Structure 缓冲层和帽层对缓冲层/CoFeB/MgO/帽结构热稳定垂直磁各向异性的影响

IF 1.2 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2022-11-09 DOI: 10.1109/LMAG.2022.3221050

Wei Du;Mengli Liu;Fengxuan Han;Hua Su;Bo Liu;Hao Meng;Xiaoli Tang

引用次数: 0

Iterative Multihead Multitrack Detection Scheme for Bit-Patterned Media Recording 用于位模式媒体记录的迭代多磁头多磁道检测方案

IF 1.2 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2022-11-03 DOI: 10.1109/LMAG.2022.3219234

Gyuyeol Kong;Taehyoung Kim;Minchae Jung

{"title":"Iterative Multihead Multitrack Detection Scheme for Bit-Patterned Media Recording","authors":"Gyuyeol Kong;Taehyoung Kim;Minchae Jung","doi":"10.1109/LMAG.2022.3219234","DOIUrl":"https://doi.org/10.1109/LMAG.2022.3219234","url":null,"abstract":"An iterative multihead multitrack detection scheme for bit-patterned media recording is described in this letter. The scheme employs two iterative strategies with multihead, multitrack detection where three tracks are simultaneously processed to accurately estimate the channel with track misregistration (TMR) and effectively detect the data by using intertrack interference (\u0000<bold>ITI</b>\u0000) information with high reliability. The first outer iteration aims to compensate for the TMR effect, and the second inner iteration aims to improve the reliability of the data. In the outer iteration, the TMR effect is compensated by modifying the generalized partial response (GPR) target to a channel that reflects the TMR estimated by a TMR estimator using an expectation and maximization algorithm. In the inner iteration, iterative equalization and decoding (IED) is conducted between the two-dimensional partial response maximum-likelihood detector and the low-density parity check decoder based on the revised GPR target. Since each track has a different channel performance according to the amount of ITI information in the multitrack detection, we design the GPR target and the code rate separately for each track to maximize the overall channel performance. The bit error rate performances of the proposed IED scheme are compared with the conventional IED scheme when the areal density is 2 \u0000<inline-formula><tex-math>$text{Tb/in}^{2}$</tex-math></inline-formula>\u0000. Simulation results show that the IED scheme has more than 2 dB gain compared with the conventional IED scheme for 30\u0000<inline-formula><tex-math>$%$</tex-math></inline-formula>\u0000 TMR.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"13 ","pages":"1-5"},"PeriodicalIF":1.2,"publicationDate":"2022-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67741659","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

Experimental Demonstration of a Spin-Wave Lens Designed With Machine Learning 利用机器学习设计的自旋波透镜的实验演示

IF 1.2 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2022-09-26 DOI: 10.1109/LMAG.2022.3209647

Martina Kiechle;Levente Maucha;Valentin Ahrens;Carsten Dubs;Wolfgang Porod;Gyorgy Csaba;Markus Becherer;Adam Papp

{"title":"Experimental Demonstration of a Spin-Wave Lens Designed With Machine Learning","authors":"Martina Kiechle;Levente Maucha;Valentin Ahrens;Carsten Dubs;Wolfgang Porod;Gyorgy Csaba;Markus Becherer;Adam Papp","doi":"10.1109/LMAG.2022.3209647","DOIUrl":"https://doi.org/10.1109/LMAG.2022.3209647","url":null,"abstract":"In this letter, we present the design and experimental realization of a device that acts like a spin-wave lens i.e., it focuses spin waves to a specified location. The structure of the lens does not resemble any conventional lens design. It is a nonintuitive pattern produced by a machine-learning algorithm. As a spin-wave design tool, we used our custom micromagnetic solver SpinTorch, which has built-in automatic gradient calculation and can perform backpropagation through time for spin-wave propagation. The training itself is performed with the saturation magnetization of a yttrium-iron-garnet (YIG) film as a variable parameter, with the goal to guide spin waves to a predefined location. We verified the operation of the device in the widely used mumax\u0000<inline-formula><tex-math>$^{3}$</tex-math></inline-formula>\u0000 micromagnetic solver, and by experimental realization. For the experimental implementation, we developed a technique to create effective saturation-magnetization landscapes in YIG by direct focused-ion-beam (FIB) irradiation. This allows us to rapidly transfer the nanoscale design patterns to the YIG medium, without patterning the material by etching. We measured the effective saturation magnetization corresponding to the FIB dose levels in advance and used this mapping to translate the designed scatterer to the required dose levels. Our demonstration serves as a proof of concept for a workflow that can be used to realize more sophisticated spin-wave devices with complex functionality, e.g., spin-wave signal processors, or neuromorphic devices.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"13 ","pages":"1-5"},"PeriodicalIF":1.2,"publicationDate":"2022-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67741658","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: 6

Novel Magnetic Localization Methods for Minimizing the Ellipse Error Based on Tensor Invariants 基于张量不变量的最小化椭圆误差的磁定位新方法

IF 1.2 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2022-09-12 DOI: 10.1109/LMAG.2022.3205881

Xiangang Li;Shenggang Yan;Jianguo Liu;Youyu Yan

引用次数: 1

Robustness of Binary Stochastic Neurons Implemented With Low Barrier Nanomagnets Made of Dilute Magnetic Semiconductors 用稀磁半导体制成的低势垒纳米磁体实现二元随机神经元的鲁棒性

IF 1.2 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2022-08-26 DOI: 10.1109/LMAG.2022.3202135

Rahnuma Rahman;Supriyo Bandyopadhyay

{"title":"Robustness of Binary Stochastic Neurons Implemented With Low Barrier Nanomagnets Made of Dilute Magnetic Semiconductors","authors":"Rahnuma Rahman;Supriyo Bandyopadhyay","doi":"10.1109/LMAG.2022.3202135","DOIUrl":"https://doi.org/10.1109/LMAG.2022.3202135","url":null,"abstract":"Binary stochastic neurons (BSNs) are excellent hardware accelerators for machine learning. A popular platform for implementing them is low- or zero-energy barrier nanomagnets possessing in-plane magnetic anisotropy (e.g., circular disks or quasi-elliptical disks with very small eccentricity). Unfortunately, small geometric variations in the lateral shapes of such nanomagnets can produce large changes in the BSN response times if the nanomagnets are made of common metallic ferromagnets (Co, Ni, Fe) with large saturation magnetization. In addition, the response times become very sensitive to initial conditions, i.e., the initial magnetization orientation. In this letter, we show that if the nanomagnets are made of dilute magnetic semiconductors with much smaller saturation magnetization than common metallic ferromagnets, then the variability in their response times (due to shape variations and variation in the initial condition) is drastically suppressed. This significantly reduces the device-to-device variation, which is a serious challenge for large-scale neuromorphic systems. A simple material choice can, therefore, alleviate one of the most aggravating problems in probabilistic computing with nanomagnets.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"13 ","pages":"1-4"},"PeriodicalIF":1.2,"publicationDate":"2022-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67902601","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: 5

Theoretical Circuit Design of an Efficient Spintronic Random Number Generator With an Internal Postprocessing Unit 带内部后处理单元的高效自旋电子随机数发生器的理论电路设计

IF 1.2 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2022-08-19 DOI: 10.1109/LMAG.2022.3200326

Saeed Mehri;Abdolah Amirany;Mohammad Hossein Moaiyeri;Kian Jafari

引用次数: 7

Longitudinal Transformation of Magnetic Properties in Magnetic Microwires With Graded Magnetic Anisotropy 梯度磁各向异性磁性微导线磁性能的纵向变换

IF 1.2 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2022-08-16 DOI: 10.1109/LMAG.2022.3199170

Alexander Chizhik;Paula Corte-León;Valentina Zhukova;Julian Gonzalez;Arcady Zhukov

引用次数: 0