Giant exchange bias by tuning Co/CoO core/shell structure

Mohapatra, Jeotikanta; Xing, Meiying; Wu, Rui; Yang, Jinbo; Liu, J. Ping

doi:10.1016/j.scriptamat.2023.115400

Cited by 4 publications

(1 citation statement)

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“…The exchange coupling interaction between soft/hard or hard/soft core-shell nanoparticles can be considered an effective approach for magnetism control. Kneller and Hawig proposed a model on exchangecoupled nanomagnets, according to the model, the integration of a soft magnetic phase with a high M s to a hard magnetic phase can amplify the magnetization of a composite magnet if the two phases are strongly exchangecoupled via the interphase interface [48][49][50]. The exchange-coupled core-shell nanoparticles, as designed, would operate as a single-phase nanomagnet, possessing magnetic anisotropy constant, coercivity, and saturation magnetization values that fall within the range of those exhibited by the individual constituents (see figure 1(a)).…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%