Spin-dependent transport properties of Fe3O4/MoS2/Fe3O4 junctions

Wu, Han; Coileáin, Cormac Ó; Abid, Muhammad; Mauit, Ozhet; Syrlybekov, Askar; Khalid, Abbas; Xu, Hongjun; Gatensby, Riley; Wang, Jing Jing; Liu, Huajun; Li, Yang; Duesberg, Georg S.; Zhang, Hongzhou; Abid, Mohamed; Shvets, I. V.

doi:10.1038/srep15984

Cited by 61 publications

(56 citation statements)

References 54 publications

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“…The I 2D /I G ratio is calculated to be %4.5, showing monolayer of graphene. [36][37][38][39][40][41][42][43][44][45] The basic purpose of this is to take the advantage of electron spin for device applications. [32,33] Lastly, we performed Raman spectroscopy for Gr-hBN heterostructure, as shown in Figure 2c.…”

Section: Resultsmentioning

confidence: 99%

Spin Valve Effect of 2D‐Materials Based Magnetic Junctions

Iqbal

Siddique

Hussain³

2017

Adv Eng Mater

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The magnetotransport properties of spin valve structure are highly influenced by the type of intervening layer inserted between the ferromagnetic electrodes. In this scenario, spin filtering effect at the interfaces plays a crucial role in determining the magnetoresistance (MR) of such magnetic structures, which can be enhanced by using a suitable intervening layer. Here, the authors investigate the spin filtering effect of the two-dimensional layers such as hexagonal boron nitride (hBN), graphene (Gr), and Gr-hBN hybrid system for modifying the magnetotransport characteristics of the vertical spin valve architectures (Ni/hBN/Ni, Ni/Gr/Ni, and Ni/Gr-hBN/Ni). Compared to graphene, hBN incorporated magnetic junction reveals higher MR and spin polarizations (P) suggesting better spin filtering at the interfaces. The MR for hBN incorporated junction is calculated to be %0.83%, while that of graphene junction it is estimated to be %0.16%. Similar contrast is observed in the 'P' of ferromagnets (FMs) for the two junctions, that is, %6.4% for hBN based magnetic junction and %2.8% for graphene device. However, for Gr-hBN device, the signal not only get inverts, but it also suggests efficient spin filtering mechanism at the FM interfaces. Their results can be useful to comprehend the origin of spin filtering and the choice of non-magnetic spacer for magnetotransport characteristics.

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Section: Resultsmentioning

confidence: 99%

Spin Valve Effect of 2D‐Materials Based Magnetic Junctions

Iqbal

Siddique

Hussain³

2017

Adv Eng Mater

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“…23 Recently, ab initio calculations and experiments have shown that monolayer MoS2 and WS2 MTJs are metallic due to strong coupling between the Fe and the S atoms at the interface, showing a magnetoresistance of ~ 0.5 %. 24,25,26 .…”

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confidence: 99%

Spin-Polarized Tunneling through Chemical Vapor Deposited Multilayer Molybdenum Disulfide

et al. 2017

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The two-dimensional (2D) semiconductor molybdenum disulfide (MoS) has attracted widespread attention for its extraordinary electrical-, optical-, spin-, and valley-related properties. Here, we report on spin-polarized tunneling through chemical vapor deposited multilayer MoS (∼7 nm) at room temperature in a vertically fabricated spin-valve device. A tunnel magnetoresistance (TMR) of 0.5-2% has been observed, corresponding to spin polarization of 5-10% in the measured temperature range of 300-75 K. First-principles calculations for ideal junctions result in a TMR up to 8% and a spin polarization of 26%. The detailed measurements at different temperature, bias voltages, and density functional theory calculations provide information about spin transport mechanisms in vertical multilayer MoS spin-valve devices. These findings form a platform for exploring spin functionalities in 2D semiconductors and understanding the basic phenomena that control their performance.

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“…In theory, a high spin polarization should result in a large TMR, which is proportional to the spin polarization of tunneling electrons . Based on this idea, various kinds of magnetite and their TMR properties have been explored in the last decades, including single crystal, epitaxial, and polycrystal films, tunneling junctions, and granular systems . However, in most cases the magnetoresistance (MR) ratio is smaller than expected, especially at room temperature.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Thickness‐Tunable ZrO₂ Shell on Enhancing the Tunneling Magnetoresistance of Fe₃O₄ Supraparticles

Xie

et al. 2018

Adv Materials Inter

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at room temperature. This degradation is caused admittedly by the reduced spin polarization due to the multiple effects of oxidation, defects, bonding, and surface reconstruction at the surfaces or interfaces of the polycrystal grain boundaries. Comparing to bulk materials, the nanoparticles can produce enhanced extrinsic MR owing to the effect of spin-dependent interface scattering or tunneling through the boundaries. [18] Additionally, the MR can still be increased by core-shell encapsulated structures. For example, an insulating shell coats on the magnetite core. In such a dielectric system, nanometric ferromagnetic particles show giant TMR by spin-dependent tunneling of conducting electrons at the magneticinsulator interfaces. Electrons with spin parallel to the particle magnetization have a bigger probability of tunneling than electrons with antiparallel spin, resulting in an overall lower resistance. Similar MR enhancement has been realized in Fe 3 O 4 @SiO 2 , [19] Fe 3 O 4 @ oleic acid, [20] Fe@Cr, [21] and Fe 3 O 4 @ZnS [22] system. Insulator zirconium dioxide (ZrO 2 ) is a nonmetallic inorganic material and has excellent resistance to acids and alkalis. It was widely applied in catalyst carrier and thermal barrier fields due to the stability and insulativity. Previous studies have shown that ZrO 2 doping in the perovskite systems can effectively enhance the magnetoresistance. [23][24][25] To the best of our knowledge, it is still unexploited of ZrO 2 doping in the half-metal Fe 3 O 4 nanoparticles by means of the core-shell structural system.In this paper, Fe 3 O 4 @ZrO 2 core-shell nanocomposites are prepared with controllable shell thickness and core-size. The pomegranate-like core is obtained and composed of several monocrystals and single-domain Fe 3 O 4 nanocrystals with size <10 nm. The magnetic structure and magnetotransport property of the core-shell nanocomposites are explored. Our results show that the MR is increased to ≈7.5% at 2 kOe in this core-shell system compared to that of pure Fe 3 O 4 nanoparticles ≈4.7%. Moreover, as Zr content increases, the MR first increases and then decreases. This is because the addition of insulated barrier promotes the tunneling effect, which enhances the MR, but with further increase of ZrO 2 thickness, the barrier becomes larger and the electron tunneling becomes difficult, leading to the reduced MR. In addition, the results of Fe 3 O 4 @ZrO 2 with different core sizes show that the MR rises monotonically with a decrease of the size of core. Moreover, for eliminate the possible effect of ZrO 2 permeating into the interior of the pomegranate-like core, fault-cutting is prepared andThe core-shell Fe 3 O 4 @ZrO 2 nanoparticles with controllable shell thickness and core dimensions are synthesized using solvothermal approaches. The introduction of the insulator ZrO 2 shell allows realizing the enhancement of tunneling magnetoresistance (TMR) effect of the functional nanomaterials. The influences of temperature, magnetic field, and shell thickness on the TMR are ...

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Spin-dependent transport properties of Fe3O4/MoS2/Fe3O4 junctions

Cited by 61 publications

References 54 publications

Spin Valve Effect of 2D‐Materials Based Magnetic Junctions

Spin Valve Effect of 2D‐Materials Based Magnetic Junctions

Spin-Polarized Tunneling through Chemical Vapor Deposited Multilayer Molybdenum Disulfide

The Effect of Thickness‐Tunable ZrO₂ Shell on Enhancing the Tunneling Magnetoresistance of Fe₃O₄ Supraparticles

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Spin-dependent transport properties of Fe3O4/MoS2/Fe3O4 junctions

Cited by 61 publications

References 54 publications

Spin Valve Effect of 2D‐Materials Based Magnetic Junctions

Spin Valve Effect of 2D‐Materials Based Magnetic Junctions

Spin-Polarized Tunneling through Chemical Vapor Deposited Multilayer Molybdenum Disulfide

The Effect of Thickness‐Tunable ZrO2 Shell on Enhancing the Tunneling Magnetoresistance of Fe3O4 Supraparticles

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The Effect of Thickness‐Tunable ZrO₂ Shell on Enhancing the Tunneling Magnetoresistance of Fe₃O₄ Supraparticles