A magnetic sensor using a 2D van der Waals ferromagnetic material

Jimenez, Valery Ortiz; Kalappattil, Vijaysankar; Eggers, Tatiana; Bonilla, Manuel; Kolekar, Sadhu; Huy, Phạm Thành; Batzill, Matthias; Phan, Manh‐Huong

doi:10.1038/s41598-020-61798-2

Cited by 33 publications

(19 citation statements)

References 19 publications

(22 reference statements)

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“…For instance, 2DMMs can also be used to construct nanoscale sensors, magnetic memory, and logic devices. A good example is a highly sensitive magnetic sensor based on a magnetic microwire coil, where monolayer VSe 2 is working as the magnetic core [98]. The working principle of this sensor is to detect the signal of the resonant frequency of the LC circuit under the varying DC magnetic fields.…”

Section: Conclusion and Future Perspectivementioning

confidence: 99%

Recent Advances in Two-Dimensional Magnets: Physics and Devices towards Spintronic Applications

et al. 2020

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The emergence of low-dimensional nanomaterials has brought revolutionized development of magnetism, as the size effect can significantly influence the spin arrangement. Since the first demonstration of truly two-dimensional magnetic materials (2DMMs) in 2017, a wide variety of magnetic phases and associated properties have been exhibited in these 2DMMs, which offer a new opportunity to manipulate the spin-based devices efficiently in the future. Herein, we focus on the recent progress of 2DMMs and heterostructures in the aspects of their structural characteristics, physical properties, and spintronic applications. Firstly, the microscopy characterization of the spatial arrangement of spins in 2D lattices is reviewed. Afterwards, the optical probes in the light-matter-spin interactions at the 2D scale are discussed. Then, particularly, we systematically summarize the recent work on the electronic and spintronic devices of 2DMMs. In the section of electronic properties, we raise several exciting phenomena in 2DMMs, i.e., long-distance magnon transport, field-effect transistors, varying magnetoresistance behavior, and (quantum) anomalous Hall effect. In the section of spintronic applications, we highlight spintronic devices based on 2DMMs, e.g., spin valves, spin-orbit torque, spin field-effect transistors, spin tunneling field-effect transistors, and spin-filter magnetic tunnel junctions. At last, we also provide our perspectives on the current challenges and future expectations in this field, which may be a helpful guide for theorists and experimentalists who are exploring the optical, electronic, and spintronic properties of 2DMMs.

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Section: Conclusion and Future Perspectivementioning

confidence: 99%

Recent Advances in Two-Dimensional Magnets: Physics and Devices towards Spintronic Applications

et al. 2020

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“…Light-induced magnetization measurements on the WS 2 and V-WS 2 monolayer films were performed with a magnetic microwire LC resonator as the sensing element (see Figure S2, Supporting Information). [25] The reactance (X) was monitored as the light illuminates the film with an HP 4191A impedance analyzer. Two different lasers of 650 nm wavelength but different spot sizes were used.…”

Section: Methodsmentioning

confidence: 99%

“…In order to probe the light-induced magnetization of an atomically thin magnetic film such as V-WS 2 monolayers, we propose a new technique utilizing our recently developed magneto-LC resonance sensor with ultrahigh magnetic field sensitivity (pT regime). [24,25] The sensing element of this device is a magnetic microwire wound into a coil driven with a frequency of 118 MHz, which is near the coil's LC resonance (Figure S2, Supporting Information). The impedance of the coil is then measured with an impedance analyzer, from which we extract the reactance of the coil.…”

Section: Probing Light-induced 2d Magnetismmentioning

confidence: 99%

Light‐Controlled Room Temperature Ferromagnetism in Vanadium‐Doped Tungsten Disulfide Semiconducting Monolayers

Jimenez

Pham

Liu

et al. 2021

Adv Elect Materials

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Atomically thin transition metal dichalcogenide (TMD) semiconductors hold enormous potential for modern optoelectronic devices and quantum computing applications. By inducing long-range ferromagnetism (FM) in these semiconductors through the introduction of small amounts of a magnetic dopant, it is possible to extend their potential in emerging spintronic applications. Here, we demonstrate light-mediated, room temperature (RT) FM, in V-doped WS 2 (V-WS 2 ) monolayers. We probe this effect using the principle of magnetic LC resonance, which employs a soft ferromagnetic Co-based microwire coil driven near its resonance in the radio frequency (RF) regime. The combination of LC resonance with an extraordinary giant magneto-impedance effect, renders the coil highly sensitive to changes in the magnetic flux through its core. We then place the V-WS 2 monolayer at the core of the coil where it is excited with a laser while its change in magnetic permeability is measured. Notably, the magnetic permeability of the monolayer is found to depend on the laser intensity, thus confirming light control of RT magnetism in this two-dimensional (2D) material. Guided by density functional calculations, we attribute this phenomenon to the presence of excess holes in the conduction and valence bands, as well as carriers trapped in the magnetic doping states, which in turn mediates the magnetization of the V-WS 2 monolayer. These findings provide a unique route to exploit light-controlled ferromagnetism in low powered 2D spintronic devices capable of operating at RT.

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“…The MLCR sensor that utilizes the advantages of the giant magneto-impedance (GMI) effect of an ultrasoft magnetic Co-rich microwire [18], and an LC resonance circuit of an inductive coil made of the Co-rich microwire, has recently been developed by our group for real-time respiratory monitoring [19] and for spintronics applications [20]. Details of the design and fabrication of the MLCR sensor have been reported in Ref.…”

Section: Methodsmentioning

confidence: 99%

A Novel Magnetic Respiratory Sensor for Human Healthcare

et al. 2021

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Breathing is vital to life. Therefore, the real-time monitoring of a patient′s breathing pattern is crucial to respiratory rehabilitation therapies, such as magnetic resonance exams for respiratory-triggered imaging, chronic pulmonary disease treatment, and synchronized functional electrical stimulation. While numerous respiratory devices have been developed, they are often in direct contact with a patient, which can yield limited data. In this study, we developed a novel, non-invasive, and contactless magnetic sensing platform that can precisely monitor a patient′s breathing, movement, or sleep patterns, thus providing efficient monitoring at a clinic or home. A magneto-LC resonance (MLCR) sensor converts the magnetic oscillations generated by a patient′s breathing into an impedance spectrum, which allows for a deep analysis of one′s breath variation to identify respiratory-related diseases like COVID-19. Owing to its ultrahigh sensitivity, the MLCR sensor yields a distinct breathing pattern for each patient tested. It also provides an accurate measure of the strength of a patient′s breath at multiple stages as well as anomalous variations in respiratory rate and amplitude. The sensor can thus be applied to detect symptoms of COVID-19 in a patient, due to shortness of breath or difficulty breathing, as well as track the disease′s progress in real time.

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A magnetic sensor using a 2D van der Waals ferromagnetic material

Cited by 33 publications

References 19 publications

Recent Advances in Two-Dimensional Magnets: Physics and Devices towards Spintronic Applications

Recent Advances in Two-Dimensional Magnets: Physics and Devices towards Spintronic Applications

Light‐Controlled Room Temperature Ferromagnetism in Vanadium‐Doped Tungsten Disulfide Semiconducting Monolayers

A Novel Magnetic Respiratory Sensor for Human Healthcare

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