New horizons for microwave applications using spin caloritronics

Gui, Y. S.; Mehrabani, Ali M.; Flores-Tapia, Daniel; Fu, Lei; Bai, Lihui; Pistorius, Stephen; Shafai, L.; Hu, C.‐M.

doi:10.1016/j.ssc.2014.07.026

Cited by 5 publications

(8 citation statements)

References 37 publications

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“…Phase resolved techniques have also enabled the identification of non resonant rectification [396], and have been used to develop non destructive dielectric characterization techniques [184]. Also, imaging has been performed using Seebeck induced rectification [397] in MTJs [398,399].…”

Section: Spintronic Microwave Sensing and Imagingmentioning

confidence: 99%

Electrical detection of magnetization dynamics via spin rectification effects

2016

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The purpose of this article is to review the current status of a frontier in dynamic spintronics and contemporary magnetism, in which much progress has been made in the past decade, based on the creation of a variety of micro-and nano-structured devices that enable electrical detection of magnetization dynamics. The primary focus is on the physics of spin rectification effects, which are well suited for studying magnetization dynamics and spin transport in a variety of magnetic materials and spintronic devices. Intended to be intelligible to a broad audience, the paper begins with a pedagogical introduction, comparing the methods of electrical detection of charge and spin dynamics in semiconductors and magnetic materials respectively. After that it provides a comprehensive account of the theoretical study of both the angular dependence and line shape of electrically detected ferromagnetic resonance (FMR), which is summarized in a handbook formate easy to be used for analyzing experimental data. We then review and examine the similarity and differences of various spin rectification effects found in ferromagnetic films, magnetic bilayers and magnetic tunnel junctions, including a discussion of how to properly distinguish spin rectification from the spin pumping/inverse spin Hall effect generated voltage. After this we review the broad applications of rectification effects for studying spin waves, nonlinear dynamics, domain wall dynamics, spin current, and microwave imaging. We also discuss spin rectification in ferromagnetic semiconductors. The paper concludes with both historical and future perspectives, by summarizing and comparing three generations of FMR spectroscopy which have been developed for studying magnetization dynamics.

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Section: Spintronic Microwave Sensing and Imagingmentioning

confidence: 99%

Electrical detection of magnetization dynamics via spin rectification effects

2016

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“…Thermal regimes of the MTJ heating by a direct current were discussed earlier in a number of papers [7,8,17]. Therefore, we give the results of a similar calculation of the amplitudes Δ ( = 0, 1, 2 .…”

Section: Temperature Drop Across the Mtj Induced By Asymmetric Joulementioning

confidence: 79%

“…The magneto-Seebeck effect and the thermal initiating spintransfer torques in MTJ are an important part of spincaloritronic studies [1][2][3][4][5][6][7] and are of a high significance for development of nonvolatile memory and temperaturesensitive devices [8][9][10]. Spin-torque diode effect in a magnetic tunnel structure is the voltage rectification effect via the microwave modulation of the active component of the MTJ resistance due to the spin-transfer torque [11].…”

Section: Introductionmentioning

confidence: 99%

Bolometric Properties of a Spin-Torque Diode Based on a Magnetic Tunnel Junction

Demin

Zvezdin

Popkov

2019

Advances in Condensed Matter Physics

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Spin caloritronics opens up a wide range of potential applications, one of which can be the thermoelectric rectification of a microwave signal by spin-diode structures. The bolometric properties of a spin-torque diode based on a magnetic tunnel junction (MTJ) in the presence of a thermal gradient through a tunnel junction are discussed. Theoretical estimates of the static and dynamic components of the microwave sensitivity of the spin-torque diode, related to thermoelectric tunnel magneto-Seebeck effect and the thermal transfer of spin angular momentum in the MTJ under nonuniform heating, are presented. Despite the fact that the thermal contribution to the microwave sensitivity of the spin-torque diode is found to be relatively small in relation to the rectification effect related to the modulation of the MTJ resistance by a microwave spin-polarized current, nevertheless, the considered bolometric effect can be successfully utilized in some real-world microwave applications.

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“…In this work, we study the potential of the method of holographic detection and visualization of objects using highly sensitive spin diodes. Those diodes possess advantages at low microwave irradiation power [3][4][5][6][20][21][22] and can show a significantly higher sensitivity than the sensitivity of a Schottky diode at a similar level of equivalent input noise [16]. Estimates show that for a specified sensitivity, taking into account the radiation safety standards, there exists at least 25 m safe obstacle detection range.…”

Section: Introductionmentioning

confidence: 99%

Spin Diode Based Microwave Registration and Holographic Visualization of Wave Front Scattering for an Autonomous Driving System

Zvezdin¹,

Leshchiner²,

Popkov³

et al. 2020

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In the paper, we discuss the scheme and the prospects of holographic visualization for microwave scattering objects. At the core of our method is microwave registrationbased on spin diodes, to identify obstacles to the movement for the car's autonomous driving system. The resolution of the holographic system grows with wavelength decrease. However, the recording capacity at a given level of irradiating signal and diode noise decreases. We give an algorithm for the numerical reconstruction and visualization of obstacles. Estimates for the resolution and the reliability of object identification, depending on the distance to the obstacle, obtained by numerical modeling. We show that there is an optimal wavelength to reach the maximum distance of microwave recording, taking into account the system resolution and the acceptable signal level. Highly sensitive spin diodes, feasible for the 2-30 cm wavelength range, nearly approach the optimum range, which is ~ 0.5-1 cm for Schottky diodes, in their holographic visualization ability. Based on the Kotelnikov theorem for the sampling frequency of a harmonic signal, and on numerical experiments, the requirements for the placement density of the receiving elements of the recorder antenna array were determined depending on the distance to the object, the number of sensors and the recording window size. We show that a microwave-recording device based on spin diodes can be promising for an autonomous driving system in conditions of constrained movement with poor visibility and high noise.

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New horizons for microwave applications using spin caloritronics

Cited by 5 publications

References 37 publications

Electrical detection of magnetization dynamics via spin rectification effects

Electrical detection of magnetization dynamics via spin rectification effects

Bolometric Properties of a Spin-Torque Diode Based on a Magnetic Tunnel Junction

Spin Diode Based Microwave Registration and Holographic Visualization of Wave Front Scattering for an Autonomous Driving System

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