Magnetoresistance of FePt nanograins embedded in carbon matrix

Lee, Yu‐Hua; Guo, Meiyou; Wur, Ching-Shuei; Lin, Ping; Li, Wen-Hsien

doi:10.1016/j.jmmm.2004.09.049

Cited by 6 publications

(1 citation statement)

References 16 publications

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“…This enhancement at lower temperatures can be attributed to the spin-dependent electron transport through granular channel having magnetic intergranular interaction of ferromagnetic type. Lee et al have explained the spin dependent electron transport in similar systems with the huge magnetoresistance at low temperature [29] . The magnetoresistance drastically reduces with increase in temperature as the tunneling activation energy of this system is small.…”

Section: Resultsmentioning

confidence: 99%

Tunable electron transport with intergranular separation in FePt-C nanogranular films

Joseph

Wang

Varaprasad

et al. 2020

Mater. Res. Express

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We report electron transport mechanism in FePt-C granular films as a function of temperature by varying intergranular separation. FePt-C nanogranular films were prepared by sputtering on MgO substrates. From magnetic measurement of the sample, a coercivity of about 3T was found in the perpendicular direction. Above 25 K, the electrical resistivity of the films were found to obey Mott variable range hopping, Efros-Shklovskii variable range hopping and extended critical regime depending on the intergranular separation. However, at lower temperatures it deviates from the above behaviour showing an increase in conductance. Reduced activation energy calculated from resistivity data of these films shows metal-insulator transition. The metallic nature observed at low temperature was attributed to the intergranular ferromagnetic type ordering between granules that enhances the transport of electrons. Intergranular separation, thus, can be used as a tool to engineer the electron transport mechanism to different hopping regimes or extended critical regime in these films.

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Section: Resultsmentioning

confidence: 99%

Tunable electron transport with intergranular separation in FePt-C nanogranular films

Joseph

Wang

Varaprasad

et al. 2020

Mater. Res. Express

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Hard Magnetic Films

Shima

Takanashi

2007

Handbook of Magnetism and Advanced Magnetic Materials

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Hard magnetic films, showing high magnetocrystalline anisotropy, have been attracting much attention recently for application to magnetic devices since the critical grain size for superparamagnetic limit can be reduced to the nanometer scale. In this chapter, the fabrication techniques and the magnetic properties of hard magnetic films are reviewed. Firstly, the fundamental phenomena and models which are important for the understanding of hard magnetic properties in thin films are described. Secondly, the recent developments of hard magnetic films and their potential applications are mentioned. Particularly the relationship between micro‐/nanostructure and the magnetization process (coercivity mechanism) is discussed in detail for rare earth–transition metal alloy films and L1 0 ‐ordered FePt films.

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2.3.2 FePt-based nanomaterials

Djéga‐Mariadassou

2015

Nanocrystalline Materials, Part B

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Magnetoresistance of FePt nanograins embedded in carbon matrix

Cited by 6 publications

References 16 publications

Tunable electron transport with intergranular separation in FePt-C nanogranular films

Tunable electron transport with intergranular separation in FePt-C nanogranular films

Hard Magnetic Films

2.3.2 FePt-based nanomaterials

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