Oblique-incidence Sagnac interferometric scanning microscope for studying magneto-optic effects of materials at low temperatures

Zhu, Xiangwei; Ullah, R. R.; Taufour, Valentin

doi:10.1063/5.0042574

Cited by 11 publications

(5 citation statements)

References 26 publications

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“…It is worth noting that 1550 nm CW laser has also been used in the all-fiber design of Sagnac interferometer for magneto-optical measurements of ferromagnetic resonance [210]. Sagnac interferometers have proven as a powerful technique that can measure the magneto-optical Kerr effect with 100 nrad/ √ Hz sensitivity using only a 10 µW optical power without the magnetic field modulation [211][212][213][214][215][216][217]. Recently, this technique is employed in the magneto-optical detection of photoinduced magnetism via chirality-induced spin selectivity in 2D chiral hybrid organic-inorganic perovskites [218].…”

Section: Other Technical Advancesmentioning

confidence: 99%

Ferromagnetic Resonance in Two-dimensional van der Waals Magnets: A Probe for Spin Dynamics

Tang¹,

Alahmed²,

Mahdi³

et al. 2023

Preprint

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The discovery of atomic monolayer magnetic materials has stimulated intense research activities in the two-dimensional (2D) van der Waals (vdW) materials community. The field is growing rapidly and there has been a large class of 2D vdW magnetic compounds with unique properties, which provides an ideal platform to study magnetism in the atomically thin limit. In parallel, based on tunneling magnetoresistance and magneto-optical effect in 2D vdW magnets and their heterostructures, emerging concepts of spintronic and optoelectronic applications such as spin tunnel field-effect transistors and spin-filtering devices are explored. While the magnetic ground state has been extensively investigated, reliable characterization and control of spin dynamics play a crucial role in designing ultrafast spintronic devices. Ferromagnetic resonance (FMR) allows direct measurements of magnetic excitations, which provides insight into the key parameters of magnetic properties such as exchange interaction, magnetic anisotropy, gyromagnetic ratio, spin-orbit coupling, damping rate, and domain structure. In this review article, we present an overview of the essential progress in probing spin dynamics of 2D vdW magnets using FMR techniques. Given the dynamic nature of this field, we focus mainly on the broadband FMR, optical FMR, and spin-torque FMR, and their applications in studying prototypical 2D vdW magnets including CrX3 (X = Cl, Br, I), Fe5GeTe2, and Cr2Ge2Te6. We conclude with the recent advances in laboratory-and synchrotron-based FMR techniques and their opportunities to broaden the horizon of research pathways into atomically thin magnets.

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Section: Other Technical Advancesmentioning

confidence: 99%

Ferromagnetic Resonance in Two-dimensional van der Waals Magnets: A Probe for Spin Dynamics

Tang¹,

Alahmed²,

Mahdi³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…We performed magneto-optical Kerr measurements on Sr 2 IrO 4 using an oblique-incidence zero-area Sagnac interferometer operating at 1550 nm wavelength to measure the in-plane magnetization 56 . The relative Kerr angle ∆θ K is obtained by subtracting temperature-independent backgrounds, coming from the instrumentation offset, measured at T = 300 K, and converted to magnetization (in µ B /ion) by a quantitative comparison of our 0.35 T Kerr data with the corresponding magnetization data in the Ref.…”

Section: Magneto-optical Kerr Measurementmentioning

confidence: 99%

Hydrogeochemical anomalies associated with the 2017 MW 5.5 Pohang earthquake in South Korea

Kim¹,

Lee²

2020

Preprint

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The 2017 MW 5.5 Pohang earthquakes, which were known as triggered by enhanced geothermal system (EGS) stimulations, had significant effects on the groundwater system. This study aimed to identify the hydrogeochemical anomalies and to understand the response mechanisms of groundwater system to the earthquake. For this, the environmental isotopes (222Rn, Sr, 2H, and 18O), major ions, and time-series data (groundwater level, temperature, and electrical conductivity) were analyzed. Principal component analysis (PCA) was also employed. The results from time-series data showed the anomalies in the groundwater wells located near the epicenter. The hydrochemical parameters including stable isotopes data of 2H and 18O showed the different change patterns among groundwater wells before/after the earthquakes, which were related to the distance from epicenter, faults, and seawater. The environmental isotopes, radon and strontium, suggested the possible mechanisms underlying the effects of earthquakes by spatial distributions, such as seawater intrusion, water-rock interactions, shallow and deep aquifer mixing, deep fluid upwelling, and bedrock fracture opening. With this, the main cluster of PCA results was also distributed along these isotope concentration gradients. Our findings proved the usefulness of environmental isotopes and hydrogeochemical parameters to understand the earthquake-related changes in groundwater system. These studied parameters and the adopted methods would be positively applied for other earthquake zones.

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“…Thus, the first application of the MOKE studied was ultra-thin Fe films grown epitaxially onto a single crystalline substrate of Au(100), and the MOKE loops for the Fe film with atomic layer sensitivity were successfully obtained as a function of film thickness and temperature [4]. Furthermore, with the rapid advancement of modern surface science and nano-engineering [5,6,7,8], the MOKE has been widely applied in studying the magnetization dynamics of magnetic materials [9,1,10,11], investigating the structure and morphology of the surface and interface [12,13,14,15,16], and even looking for the topological electromagnetic phase of matter [17,18].…”

Section: Introductionmentioning

confidence: 99%

Weak-value-amplification enhancement of the magneto-optical Kerr effect in nanoscale layered structures

Huang,

Lundeen,

Jordan

et al. 2023

Phys. Rev. A

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The achievement of the larger Magneto-optical Kerr rotations in nanoscale layered structures is extremely important for both theoretical understandings and practical applications. In this paper, we propose a scheme for simultaneously detecting the Kerr rotation and the Kerr ellipticity based on the weak-value amplification (WVA) technique. In the Magneto-optical Kerr effect study for the layered structure, the Kerr rotation and the Kerr ellipticity are obtained by calculating the boundary matrix and the transmission matrix of the layered structure. Then, the Kerr rotation and the Kerr ellipticity can be effectively amplified as the parameters of the pre-selection in the standard weak measurement. In addition, we numerically investigate the dependence of the thickness d of Co in the nanoscale layered structure HfO 2 (10 nm)/Co(d nm)/ HfO 2 (30 nm)/Al(40 nm)/Si films and the Co(d nm)/Si films at the measurement range of 5 nm < d < 50 nm. Simulation results confirmed that the Kerr rotation and the Kerr ellipticity can be effectively amplified by choosing the appropriate post-selected state, especially when the nanoscale layered structure shows no advantage for enhancing Kerr signals over the Co(d nm)/Si films without the weak-value-amplification technique. The realization of enhancement of Kerr signals in a nanoscale layered structure may have an important application in the magneto-optic (MO) parameters measurement and the MO properties in a more complex nanoscale structure.

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Oblique-incidence Sagnac interferometric scanning microscope for studying magneto-optic effects of materials at low temperatures

Cited by 11 publications

References 26 publications

Ferromagnetic Resonance in Two-dimensional van der Waals Magnets: A Probe for Spin Dynamics

Ferromagnetic Resonance in Two-dimensional van der Waals Magnets: A Probe for Spin Dynamics

Hydrogeochemical anomalies associated with the 2017 MW 5.5 Pohang earthquake in South Korea

Weak-value-amplification enhancement of the magneto-optical Kerr effect in nanoscale layered structures

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