Multi-gate non-volatile memories with nanowires as charge storage material

Tsui, Bing‐Yue; Wang, Pei Yu; Chen, Ting Yeh; Cheng, Jung‐Chien

doi:10.1016/j.microrel.2010.01.040

Cited by 6 publications

(2 citation statements)

References 11 publications

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“…Nanorods have gained significant popularity in spintronics devices due to their magnetic anisotropy and significantly larger interfacial area compared to spherical shapes [149][150][151][152]. The enhanced interfacial area of nanorods introduces additional grain boundaries, which can contribute to an increase in TMR.…”

Section: Effect Of Shape Anisotropymentioning

confidence: 99%

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Magnetic and electronic properties of anisotropic magnetite nanoparticles

Mitra,

Mohapatra,

Aslam

2024

Mater. Res. Express

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Magnetic materials at the nanometer scale can demonstrate highly tunable properties as a result of their reduced dimensionality. While significant advancements have been made in the production of magnetic oxide nanoparticles over the past decades, maintaining the magnetic and electronic phase stabilities in the nanoscale regime continues to pose a critical challenge. Finite-size effects modify or even eliminate the strongly correlated magnetic and electronic properties through strain effects, altering density and intrinsic electronic correlations. In this review, we examine the influence of nanoparticle size, shape, and composition on magnetic and tunneling magnetoresistance (TMR) properties, using magnetite (Fe3O4) as an example. The magnetic and TMR properties of Fe3O4 nanoparticles are strongly related to their size, shape, and synthesis process. Remarkably, faceted nanoparticles exhibit bulk-like magnetic and TMR properties even at ultra-small size-scale. Moreover, it is crucial to comprehend that TMR can be tailored or enhanced through chemical and/or structural modifications, enabling the creation of "artificially engineered" magnetic materials for innovative spintronic applications.

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Section: Effect Of Shape Anisotropymentioning

confidence: 99%

“…The enhanced interfacial area of nanorods introduces additional grain boundaries, which can contribute to an increase in TMR. Consequently, nanorods and nanowires offer an added advantage over conventional isotropic shapes [149,150]. Our group conducted a study on the TMR characteristics of Fe 3 O 4 nanorod assemblies.…”

Section: Effect Of Shape Anisotropymentioning

confidence: 99%

Magnetic and electronic properties of anisotropic magnetite nanoparticles

Mitra,

Mohapatra,

Aslam

2024

Mater. Res. Express

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Engineering Magnetic and Tunneling Magnetoresistance Properties of Co_xFe_3−xO₄ Nanorods

Mitra

Mohapatra

Sharma

et al. 2017

Physica Status Solidi (a)

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A simple cation exchange reaction has been adapted to produce the CoxFe3−xO4 nanorods with different concentration of Co. The substitution of Fe2+ with Co2+ ions increase the magnetocrystalline anisotropy and coercivity of pristine superparamagnetic Fe3O4 nanorods. Atomic concentration of 5–11% of Co2+ in Fe3O4 nanorods renders coercivity of 300–460 Oe at room temperature and 2200–4050 Oe at 10 K. Hydrocarbon long‐chain amine (oleylamine) functionalized nanorod assemblies form a multiple tunnel junction, where organic amine monolayers act as insulating tunnel barriers. CoxFe3−xO4 nanorods show a magnetoresistance switching behavior at room temperature and the switching field is consistent with the magnetic coercivity. A 14–15% TMR is recorded at room temperature in CoxFe3−xO4 nanorod assemblies, which increases to 23–26% at 150 K at a magnetic field of ±2 T. The calculated spin polarization for Co0.33Fe2.67O4 nanorods at room temperature is 52%. A similar spin polarization and TMR as Fe3O4 in Co‐doped Fe3O4 nanorod assemblies is obtained. Thus, controlled doping of Co ions engineers the coercivity and remanence of the “super‐paramagnetic” Fe3O4 without hindering their TMR performances, which could be very useful for memory devices.

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