Angular dependence of asymmetric magnetoimpedance in exchange biased NiFe/IrMn multilayers

Silva, R. B. da; Corrêa, M.A.; Silva, E. F.; Mori, T. J. A.; Pace, R.D. Della; Dutra, R.; Viegas, A.D.C.; Bohn, F.; Sommer, R.L.

doi:10.1063/1.4867973

Cited by 41 publications

(39 citation statements)

References 28 publications

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“…These numerical calculation results obtained for exchange biased systems are in qualitative agreement with experimental results found in literature for ferromagnetic films with exchange bias 28,29,39 .…”

Section: E Exchange Biased Systemsupporting

confidence: 80%

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Magnetoimpedance effect at the high frequency range for the thin film geometry: Numerical calculation and experiment

Corrêa

Bohn

Silva

et al. 2014

Journal of Applied Physics

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The magnetoimpedance effect is a versatile tool to investigate ferromagnetic materials, revealing aspects on the fundamental physics associated to magnetization dynamics, broadband magnetic properties, important issues for current and emerging technological applications for magnetic sensors, as well as insights on ferromagnetic resonance effect at non-saturated magnetic states. Here, we perform a theoretical and experimental investigation of the magnetoimpedance effect for the thin film geometry in a wide frequency range. We calculate the longitudinal magnetoimpedance for single layered, multilayered or exchange biased systems from an approach that considers a magnetic permeability model for planar geometry and the appropriate magnetic free energy density for each structure. From numerical calculations and experimental results found in literature, we analyze the magnetoimpedance behavior, and discuss the main features and advantages of each structure. To test the robustness of the approach, we directly compare theoretical results with experimental magnetoimpedance measurements obtained in a wide range of frequencies for an exchange biased multilayered film. Thus, we provide experimental evidence to confirm the validity of the theoretical approach employed to describe the magnetoimpedance in ferromagnetic films, revealed by the good agreement between numerical calculations and experimental results.

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Section: E Exchange Biased Systemsupporting

confidence: 80%

“…Experimentally, studies on MI have been widely performed in sheets 9 , magnetic ribbons 10-15 , wires [16][17][18][19][20][21][22][23] , and in ferromagnetic films with several structures, such as single layered [24][25][26] , multilayered 2,27-33 , and structured multilayered samples [28][29][30][33][34][35][36][37][38][39] .…”

Section: Introductionmentioning

confidence: 99%

Magnetoimpedance effect at the high frequency range for the thin film geometry: Numerical calculation and experiment

Corrêa

Bohn

Silva

et al. 2014

Journal of Applied Physics

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“…In this sense, to improve the linear features of the MI response, studies have been carried out considering differ- * Electronic address: felipebohn@gmail.com ent magnetic systems, including wires [6,8], amorphous ribbons [7,9], and exchange biased multilayers [5,10]. All of them exhibit asymmetric magnetoimpedance (AMI), characterized by a linear response around zero magnetic field, opening possibilities for the use of this kind of materials for the development of auto-biased linear magnetic field sensors.…”

Section: Introductionmentioning

confidence: 99%

“…Although soft magnetic materials are highly sensitive to small field variations, they present a nonlinear MI behavior around zero field. This makes difficult the derivation of an appropriate signal for sensor applications [5,6].…”

Section: Introductionmentioning

confidence: 99%

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Asymmetric magnetoimpedance effect in ferromagnetic multilayered biphase films

Silva

Gamino

et al. 2015

Journal of Magnetism and Magnetic Materials

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effect in ferromagnetic multilayered biphase films, Journal of Magnetism and Magnetic Materials, http://dx.We investigate the magnetoimpedance effect in ferromagnetic multilayered biphase films. We verify that the films present asymmetric magnetoimpedance behavior and, by playing with the number of the repetitions of the base structure of the multilayer and the probe current frequency, we explore the possibility of tailoring the linear region around zero magnetic field in order to achieve higher sensitivity values. The highest sensitivity is observed for the thicker film, reaching ∼ 15 mΩ/Oe at ∼ 0.52 GHz. Thus, the results open the possibilities for application of ferromagnetic multilayered biphase films with asymmetric magnetoimpedance effect in sensors devices.

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Wireless Multiferroic Memristor with Coupled Giant Impedance and Artificial Synapse Application

Wang

Xiao

et al. 2022

Adv Elect Materials

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estimated that more than 30 billion of IoT nodes, [1] such as sensors, radio-frequency identification (RFID) tags, and smart phones etc., will realize the network connection by 2025. Usually the IoT nodes are required to sense the environment, process the sensed data locally and transmit preconditioned data wirelessly; however, their power budgets are severely tight since the IoT nodes are usually powered by the battery or energy harvester. Correspondingly in order to realize the multifunction of IoT nodes with limited power budgets, the researchers have tried to integrate the microprocessor, memory, and graphic processor on a chip to realize the parallel processing of multiple tasks. For example, Kim proposed memory mapping technologies [2] to save the energy consumption of ferroelectric random access memory (FeRAM) based IoT nodes. Engel studied the low power consumed particle algorithm [3] to optimize the data transfer among storage, computing, sensing, and wireless communication units. However, the power consumption and computation speed of IoT nodes are still hindered by the von Neumann computing architecture with physically separated memory and processing units. Furthermore the current IoT nodes [1][2][3] usually implement the separated wireless communication modules (e.g., Bluetooth and RFID) to transmit and receive information of the memory and computation units, which impede the integration of chip and further increase the power consumption due to the large amount of data transferred among different units.In order to break the bottleneck of von Neumann computing architecture, various memristors [4][5][6][7][8][9][10][11][12] have been studied to construct the energy and computation speed efficient computing system (e.g., neuromorphic computing system) by integrating the memory and computation functions in a single device. Specifically the neuromorphic computing system is inspired by the human brain, which enables parallel signal storage and processing with much lower energy consumption. It is known that human brain comprises ≈10 11 neurons interconnected with 10 15 synapses, [4] whose connection strength can be regulated in response to neural stimuli. Since the conduction of memristor varies depending on the history of electrical stimuli, it can be utilized to mimic the plasticity of synapses (i.e., synaptic weight) and modulate the strength of connection between neighboring neurons. Recently various memristor-based synapse devices Internet of things (IoT) becomes part of everyday life across the globe, whose nodes are able to sense, store, and transmit information wirelessly. However, the IoT nodes based on von Neumann architectures realize the memory, computing and communication functions with physical separated devices, which result in severe power consumption and computation latency. In this study, a wireless multiferroic memristor consisting of Metglas/Pb(Zr 0.3 Ti 0.7 ) O 3 -1 mol% Mn/Metglas laminate is proposed, which integrates the storage, processing, and wireless communication of information i...

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Angular dependence of asymmetric magnetoimpedance in exchange biased NiFe/IrMn multilayers

Cited by 41 publications

References 28 publications

Magnetoimpedance effect at the high frequency range for the thin film geometry: Numerical calculation and experiment

Magnetoimpedance effect at the high frequency range for the thin film geometry: Numerical calculation and experiment

Asymmetric magnetoimpedance effect in ferromagnetic multilayered biphase films

Wireless Multiferroic Memristor with Coupled Giant Impedance and Artificial Synapse Application

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