Influence of nano-oxide layer on the giant magnetoresistance and exchange bias of NiMn/Co/Cu/Co spin valve sensors

Gupta, Anoop; Mohanan, Senthilnathan; Kinyanjui, Michael Kiarie; Kaiser, Ute; Herr, U.

doi:10.1063/1.3407569

Cited by 8 publications

(5 citation statements)

References 22 publications

(26 reference statements)

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“…Inorganic materials with hollow structures have received considerable attention due to their potential applications in various fields . Among all the metal oxides, copper oxide (CuO) is one of the most studied materials in the literature because of its potential application for gas sensors, optical switches, electrodes, catalysis, high-temperature super conductors, and giant magneto-resistance materials . Various morphologies of CuO such as nanowires, cubes, spheres or hollow spheres, flower-like structures, cages, and octahedrals have been reported.…”

Section: Introductionmentioning

confidence: 99%

“…22 Among all the metal oxides, copper oxide (CuO) is one of the most studied materials in the literature because of its potential application for gas sensors, 23 optical switches, 24 electrodes, catalysis, 25 high-temperature super conductors, 26 and giant magneto-resistance materials. 27 Various morphologies of CuO such as nanowires, 28 cubes, 29 spheres or hollow spheres, 30 flower-like structures, 31 cages, and octahedrals 32 have been reported. The solid carbon spheres produced from plastic wastes have been successfully utilized as the template material for the synthesis of CuO hollow microspheres with precipitation method.…”

Section: ■ Introductionmentioning

confidence: 99%

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Utilization of Plastic Wastes for Synthesis of Carbon Microspheres and Their Use as a Template for Nanocrystalline Copper(II) Oxide Hollow Spheres

Sawant

Somani

Panda

et al. 2013

ACS Sustainable Chem. Eng.

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The metal- and solvent-free single-step approach for the synthesis of carbon microspheres using various municipal plastic wastes at 700 °C under autogenic pressure is reported. The obtained carbon spheres have been characterized with different microscopic and spectroscopic techniques. The microscopic analysis showed formation of carbon microspheres having diameters of 1–8 μm. Among the different types of plastic wastes studied, only polyethylene, polypropylene, and polyacrylate could be converted into carbon spheres with 100% purity, whereas carbon particles with irregular shapes were also observed in the cases of other plastic wastes. The absence of catalyst makes the carbon spheres free from metal impurities and avoids the further purification process. The synthesis of carbon spheres from plastic wastes proceeds with the formation of aromatic hydrocarbons. The nanocrystalline CuO hollow spheres with a wall thickness of ∼130 nm have been prepared using plastic waste-derived carbon spheres as the template material under ultrasonic treatment.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Utilization of Plastic Wastes for Synthesis of Carbon Microspheres and Their Use as a Template for Nanocrystalline Copper(II) Oxide Hollow Spheres

Sawant

Somani

Panda

et al. 2013

ACS Sustainable Chem. Eng.

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“…The crystallization of CoFeB results in non-uniformly distributed spikes on the sample surface, which is responsible for the large standard deviation of the measured Rq. The crystallization [61,62] and interdiffusion [63] also result in a gradual increase in Rq with Tan. The changes in phases and structures in CoFeB/IrMn bilayers after annealing altered the magnetic properties of the continuous films, antidot and nanodot samples, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Exchange bias study of sub-100 nm-diameter CoFeB/IrMn antidot and nanodot arrays fabricated by nanosphere lithography

Leung

Chiu

et al. 2017

Physics Letters A

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“…This indicates that the structural defects and disorders formed during deposition are relaxed during the low-temperature annealing. Further increasing Tan to 573 K results in a gradual increase in Rq, which is contributed by the grain growth with increasing Tan [49].…”

Section: Resultsmentioning

confidence: 99%

Exchange bias study of CoFeB/IrMn antidot and nanodot arrays fabricated by nanosphere lithography

Leung

Lin

et al. 2016

2016 5th International Symposium on Next-Generation Electronics (ISNE)

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Exchange-biased bilayers are widely used as reference layers in nanometric spintronic devices. While the magnetic properties of polycrystalline multilayers are widely reported, the exchange bias effect in nanostructures containing amorphous ferromagnetic layers are not systematically investigated. In this work, CoFeB/IrMn antidot and nanodot arrays were patterned by nanosphere lithography. The average diameter of pores in the antidot arrays changes from 88 nm to 105 nm as the thin film thickness increases from 20.8 nm to 28.5 nm, while the size of nanodots are kept at 60 nm. The exchange bias and coercivity of the nanostructures and continuous films exhibit similar exponential dependence on CoFeB layer thickness. The vacuum annealing under magnetic field results in structural relaxation, interdiffusion, and CoFeB crystallization, as the annealing temperature is increased from 373 K to 673 K. These mechanisms are responsible for the changes in crystallinity, surface roughness, and magnetic properties. Reduced coercivity and enhanced exchange bias is observed after annealing at low temperatures, while high-temperature annealing (> 573 K) results in higher coercivity and lower exchange bias.This work provides physical insights on the magnetization reversal response in nanosized spintronic devices involving CoFeB/IrMn reference layers.

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Influence of nano-oxide layer on the giant magnetoresistance and exchange bias of NiMn/Co/Cu/Co spin valve sensors

Abstract: Articles you may be interested inCo2MnGe-based current-perpendicular-to-the-plane giant-magnetoresistance spin-valve sensors for recording head applications

Cited by 8 publications

References 22 publications

Utilization of Plastic Wastes for Synthesis of Carbon Microspheres and Their Use as a Template for Nanocrystalline Copper(II) Oxide Hollow Spheres

Utilization of Plastic Wastes for Synthesis of Carbon Microspheres and Their Use as a Template for Nanocrystalline Copper(II) Oxide Hollow Spheres

Exchange bias study of sub-100 nm-diameter CoFeB/IrMn antidot and nanodot arrays fabricated by nanosphere lithography

Exchange bias study of CoFeB/IrMn antidot and nanodot arrays fabricated by nanosphere lithography

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