Extraordinary magneto-optical Kerr effect via MoS<sub>2</sub> monolayer in Au/Py/MoS<sub>2</sub> plasmonic cavity

Ghasemi, Amir Hossein Baradaran; Faridi, Ehsan; Ansari, Narges; Mohseni, Seyed Majid

doi:10.1039/c6ra21314f

Cited by 20 publications

(7 citation statements)

References 46 publications

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“…Therefore, increase of the MOKE signal can be related to the increased interaction between light and the MoS 2 @Py sample. For the case of multilayered ferromagnet/TMDC heterostructures it has been reported that proper thickness, refraction index and incident angle, can form a cavity 38 , 39 . Here we achieved enhancement of the MOKE signal via composing MoS 2 flakes with the magnetic layer.…”

Section: Resultsmentioning

confidence: 99%

Magnetic NiFe thin films composing MoS2 nanostructures for spintronic application

Vand

Jamilpanah

Zare

et al. 2022

Sci Rep

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We demonstrate a nanostructure layer made of Ni80Fe20 (permalloy:Py) thin film conjugated MoS2 nano-flakes. Layers are made based on a single-step co-deposition of Py and MoS2 from a single solution where ionic Ni and Fe and MoS2 flakes co-exist. Synthesized thin films with MoS2 flakes show increasing coercivity and enhancement in magneto-optical Kerr effect. Ferromagnetic resonance linewidth as well as the damping parameter increaseed significantly compared to that of the Py layer due to the presence of MoS2. Raman spectroscopy and elemental mapping is used to show the quality of MoS2 within the Py thin film. Our synthesis method promises new opportunities for electrochemical production of functional spintronic-based devices.

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Section: Resultsmentioning

confidence: 99%

Magnetic NiFe thin films composing MoS2 nanostructures for spintronic application

Vand

Jamilpanah

Zare

et al. 2022

Sci Rep

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“…The immobilized ss-DNA layer with a thickness of 3.3 nm, a density of 0.028 g∕cm 2 , and RI of 1.462 is located on the surface of the SPR biosensor and the whole structure is set in a water solution. In the proposed structures, based on our previous optimizations, 22,33 the thickness of the Au and Py layers is fixed at 8 and 13 nm, respectively. To compare the characteristics of conventional and 2-D material-based biosensors, we first obtain the reflection, MO, and sensitivity evaluation responses of the Au/Py bilayer structure.…”

Section: Tmoke Sensor Structurementioning

confidence: 99%

“…4(a). The enhancement of the TMOKE signal is due to the stronger excitation of the SPR waves, 33 and the sharp behavior of the TMOKE signal at the resonance condition is the reason for an increase in sensitivity. The numerical calculations predict that the sensitivity of the proposed sensor is η ¼ 880 (RIU −1 ).…”

Section: Biosensors' Responsesmentioning

confidence: 99%

“…32 For example, it was shown that the MoS 2 with resonance absorption peaks could significantly influence the MOKE detection signal in SPR sensors. 33 To reiterate, the MO detection in magnetoplasmonics is highly sensitive to any changes in the RI of the environment. Moreover, impacts of adding 2-D materials of Gr or MoS 2 on such biosensors have not been investigated so far.…”

Section: Introductionmentioning

confidence: 99%

“…We have shown that the NiFe, which is nominated as Permalloy (Py) is a quite sensitive layer against any small changes in applied magnetic field and thus very suitable for biological applications. 22,33 Here, based on the previously determined optimized thicknesses of Au(8 nm)/Py(13 nm) layers, 22,33 we vary the thicknesses of the Gr, MoS 2 , and Au top layers, and study the details of angle-dependent reflectivity and MO response. We found that the presence of three-layer Gr and twolayer MoS 2 on top of the Au/Py bilayer can increase sensitivity by nine and four times, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Au/NiFe/M(Au, MoS2, graphene) trilayer magnetoplasmonics DNA-hybridized sensors with high record of sensitivity

et al. 2017

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The demonstration of biosensors based on the surface plasmon effect holds promise for future high-sensitive electrodeless biodetection. The combination of magnetic effects with surface plasmon waves brings additional freedom to improve sensitivity and signal selectivity. Stacking biosensors with two-dimensional (2-D) materials, e.g., graphene (Gr) and MoS2, can influence plasmon waves and facilitate surface physiochemical properties as additional versatility aspects. We demonstrate magnetoplasmonic biosensors through the detuning of surface plasmon oscillation modes affected by magnetic effect via the presence of the NiFe (Py) layer and different light absorbers of Gr, MoS2, and Au ultrathin layers in three stacks of Au/Py/M(MoS2, Gr, Au) trilayers. We found minimum reflection, resonance angle shift, and transverse magneto-optical Kerr effect (TMOKE) responses of all sensors in the presence of the ss-DNA monolayer. Very few changes of ∼5×10-7 in the ss-DNA's refractive index result in valuable TMOKE response. We found that the presence of three-layer Gr and two-layer MoS2 on top of the Au/Py bilayer can dramatically increase the sensitivity by nine and four times, respectively, than the conventional Au/Co/Au trilayer. Our results show the highest reported DNA sensitivity based on the coupling of light with 2-D materials in magnetoplasmonic devices.

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Cavity‐Induced Enhancement of Magneto‐Optic Effects in Monolayer Transition Metal Dichalcogenides

Gao

et al. 2018

Advanced Optical Materials

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experimentally. [9][10][11][12][13][14] In addition, graphene allows the FR angles being controlled continuously by external parameters such as chemical potential or an external magnetic field, which is superior to that of conventional bulky magnetic materials always with fixed MO properties. Therefore, graphene opens up great possibilities for MO functionalities, such as optical isolators and one-way transmission devices based on 2D layered materials. [15,16] The successful exfoliation of monolayer transitional metal dichalcogenides (TMDC) inspires a broad exploration of optical and MO properties in related materials. [17][18][19][20][21][22][23][24][25][26][27][28][29][30] Monolayer TMDC family can be represented as the type of MX 2 (M = Mo, W, V and X = S, Se, or Te), in which M atoms are sandwiched between two planes of X atoms. The coexistence of broken inversion symmetry and strong spin-orbit coupling (SOC) of monolayer MX 2 makes them promising platforms for various valley-related properties, such as valley Hall effects as well as valley polarization. [18,20,21] It was known that the electronic structures of monolayer MoS 2 are protected by time reversal symmetry and thus there are no intrinsic magneto-optical effects in its pristine form. A key requirement for the generation of MO effects is to break time reversal symmetry, thus it is a promising way to apply an external magnetic field upon the system. [25][26][27][28] In this regard, there have been significant advancements in the MO effects of monolayer MX 2 . It has been reported that valley Zeeman splitting, polarization, and coherence of the excitonic valley pseudospin can be controlled by virtue of magnetic field, which have been observed in monolayer WSe 2 by performing polarization-resolved magnetophotoluminescence. [25] The possibility of producing a rotation of the emission polarization with respect to the excitation (the coherent superposition of valley states) has been confirmed in monolayer WS 2 (WSe 2 ), whose rotation angle can be up to 35° (30°) when the applied magnetic field reaches up to be 25 T (9 T). [29,30] These works establish the key steps toward understanding the intrinsic spin and valley properties of monolayer MX 2 .However, the above MO-related behaviors in monolayer MX 2 always require strong magnetic fields, severely restricting their realistic applications. The generation of MO effects in monolayer MX 2 will be particularly interesting if there is no need of magnetic field, as that would allow 2D layered materials in more practical positions for the realization of MO devices.Monolayer transition metal dichalcogenides represent a class of 2D directbandgap semiconductors, which do not support magneto-optical (MO) effects in the absence of magnetic field due to time reversal symmetry. Magnetic exchange field (MEF) has been demonstrated to be able to generate MO effects in monolayer transition metal dichalcogenides, causing Faraday rotation of several tenths of degree without the need of magnetic field. Here, the possibility of...

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Extraordinary magneto-optical Kerr effect via MoS₂ monolayer in Au/Py/MoS₂ plasmonic cavity

Abstract: We demonstrate a multilayer magnetoplasmonic structure fabricated from MoS2 monolayer to significantly increase the transverse magneto-optical Kerr effect (TMOKE) with a signal Q-factor more than 600.

Cited by 20 publications

References 46 publications

Magnetic NiFe thin films composing MoS2 nanostructures for spintronic application

Magnetic NiFe thin films composing MoS2 nanostructures for spintronic application

Au/NiFe/M(Au, MoS2, graphene) trilayer magnetoplasmonics DNA-hybridized sensors with high record of sensitivity

Cavity‐Induced Enhancement of Magneto‐Optic Effects in Monolayer Transition Metal Dichalcogenides

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Extraordinary magneto-optical Kerr effect via MoS2 monolayer in Au/Py/MoS2 plasmonic cavity

Abstract: We demonstrate a multilayer magnetoplasmonic structure fabricated from MoS2 monolayer to significantly increase the transverse magneto-optical Kerr effect (TMOKE) with a signal Q-factor more than 600.

Cited by 20 publications

References 46 publications

Magnetic NiFe thin films composing MoS2 nanostructures for spintronic application

Magnetic NiFe thin films composing MoS2 nanostructures for spintronic application

Au/NiFe/M(Au, MoS2, graphene) trilayer magnetoplasmonics DNA-hybridized sensors with high record of sensitivity

Cavity‐Induced Enhancement of Magneto‐Optic Effects in Monolayer Transition Metal Dichalcogenides

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Extraordinary magneto-optical Kerr effect via MoS₂ monolayer in Au/Py/MoS₂ plasmonic cavity