Large room temperature magnetoresistance in ion beam synthesized surface Fe nanoclusters on SiO2

Leveneur, Jérôme; Kennedy, J.; Williams, G. V. M.; Metson, James B.; Markwitz, A.

doi:10.1063/1.3553274

Cited by 62 publications

(25 citation statements)

References 24 publications

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“…Few reports predicted that oxide nanoparticles tend to undergo nucleation and growth of Fe ions as a result of electron beam annealing [25]. Such Fe nanoclusters are reported to cause large magnetoresistance due a combination of geometric and spin dependent scattering [26]. Moreover, Sr-doped ZnFe 2 O 4 nanoparticles synthesized by microwave combustion were investigated in terms of structural and magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Structural, Optical, and Magnetic Properties of Zn-Doped CoFe2O4 Nanoparticles

et al. 2017

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The effect of Zn-doping in CoFe2O4 nanoparticles (NPs) through chemical co-precipitation route was investigated in term of structural, optical, and magnetic properties. Both XRD and FTIR analyses confirm the formation of cubic spinel phase, where the crystallite size changes with Zn content from 46 to 77 nm. The Scherrer method, Williamson-Hall (W-H) analysis, and size-strain plot method (SSPM) were used to study of crystallite sizes. The TEM results were in good agreement with the results of the SSP method. SEM observations reveal agglomeration of fine spherical-like particles. The optical band gap energy determined from diffuse reflectance spectroscopy (DRS) varies increases from 1.17 to 1.3 eV. Magnetization field loops reveal a ferromagnetic behavior with lower hysteresis loop for higher Zn content. The magnetic properties are remarkably influenced with Zn doping; saturation magnetization (Ms) increases then decreases while both coercivity (HC) and remanent magnetization (Mr) decrease continuously, which was associated with preferential site occupancy and the change in particle size.

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Section: Introductionmentioning

confidence: 99%

Structural, Optical, and Magnetic Properties of Zn-Doped CoFe2O4 Nanoparticles

et al. 2017

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“…The various conventional methods to synthesise nanoparticles include chemical synthesis [5], polyol synthesis [6], laser ablation [7], and arc discharge [8]. Ion implantation is a novel method that could potentially be used to synthesise magnetic nanoparticles with unique properties tailored to suit different applications [9][10][11]. Near-surface iron nanoparticles have previously been synthesised in SiO 2 films using low-energy ion implantation followed by electron beam annealing [9,10].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of magnetic nanoparticles by low-energy dual ion implantation of iron and nickel into silicon dioxide followed by electron beam annealing

Prakash

Williams

Kennedy

2017

IJNT

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Magnetic nanoparticles have been made by low-energy dual ion implantation of iron and nickel into SiO 2 with a nickel fluence ratio of 82% followed by electron beam annealing for 1800 s at 1000°C. After annealing, there is significant diffusion of iron and nickel into the silicon dioxide layer. Annealing also led to the formation of superparamagnetic nanoparticles with a narrow particle size distribution. The saturation moment at 5 K was 0.7 µ B

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“…The characteristics of the core material are also fundamental to improve the intensity of the induced signal in the sense coil [2]. There are several new amorphous and crystaline (nanocrystaline) materials available [3,4,5], and deeper investigation would be necessary to see if this class of material has the potential to be used in fluxgate applications.…”

Section: Introductionmentioning

confidence: 99%

Autonomous Aeromagnetic Surveys Using a Fluxgate Magnetometer

Macharet

Perez-imaz

Rezeck

et al. 2016

Sensors

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Recent advances in the research of autonomous vehicles have showed a vast range of applications, such as exploration, surveillance and environmental monitoring. Considering the mining industry, it is possible to use such vehicles in the prospection of minerals of commercial interest beneath the ground. However, tasks such as geophysical surveys are highly dependent on specific sensors, which mostly are not designed to be used in these new range of autonomous vehicles. In this work, we propose a novel magnetic survey pipeline that aims to increase versatility, speed and robustness by using autonomous rotary-wing Unmanned Aerial Vehicles (UAVs). We also discuss the development of a state-of-the-art three-axis fluxgate, where our goal in this work was to refine and adjust the sensor topology and coupled electronics specifically for this type of vehicle and application. The sensor was built with two ring-cores using a specially developed stress-annealed CoFeSiB amorphous ribbon, in order to get sufficient resolution to detect concentrations of small ferrous minerals. Finally, we report on the results of experiments performed with a real UAV in an outdoor environment, showing the efficacy of the methodology in detecting an artificial ferrous anomaly.

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Large room temperature magnetoresistance in ion beam synthesized surface Fe nanoclusters on SiO2

Cited by 62 publications

References 24 publications

Structural, Optical, and Magnetic Properties of Zn-Doped CoFe2O4 Nanoparticles

Structural, Optical, and Magnetic Properties of Zn-Doped CoFe2O4 Nanoparticles

Synthesis of magnetic nanoparticles by low-energy dual ion implantation of iron and nickel into silicon dioxide followed by electron beam annealing

Autonomous Aeromagnetic Surveys Using a Fluxgate Magnetometer

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