Observation of large magnetic resistance in weak magnetic fields using CuPt/SiO2/Si/SiO2/CuPt structure

Hajghassem, Hassan; Banihashemian, Seyedeh Maryam; Aliahmadi, Majidreza; Mohtashamifar, Mansor

doi:10.1016/j.jmmm.2009.03.080

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Magnetic Properties Of the Mpt Nps1

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2009

2011

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“…MPt NPs, especially FePt or CoPt, represent an interesting class of materials that show structure-dependent magnetism that has been explored extensively for magnetic data storage and biomedical applications. [47][48][49][50][51] FePt containing a near-equal atomic percentage of Fe and Pt are known to have a chemically disordered face-centered cubic (fcc) structure or a chemically ordered face-centered tetragonal (fct) structure, 52 as shown in Fig. 4a & b.…”

Section: Magnetic Properties Of the Mpt Npsmentioning

confidence: 99%

Pt-based composite nanoparticles for magnetic, catalytic, and biomedical applications

Liu

Sun

2011

J. Mater. Chem.

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Section: Magnetic Properties Of the Mpt Npsmentioning

confidence: 99%

Pt-based composite nanoparticles for magnetic, catalytic, and biomedical applications

Liu

Sun

2011

J. Mater. Chem.

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“…According to his report, this structure is sensitive to a magnetic field of 500 mT at 4K [ 9 ]. The variation of magnetic resistance in CuPt/SiO 2 /Si structure has been recently investigated and reported by our team [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Low Magnetic Field Detection Using a CuPt Nano Structure Made on a SiO2/Si Structure

Hajghassem

Banihashemian

Aliahmadi³

2009

Sensors

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A Si/SiO2/CuPt structure is formed by depositing a very thin SiO2 layer between CuPt and P-type Si layers using e-beam evaporation. SEM images show the formation of CuPt nano clusters with an average size of less than 100 nm. This structure shows high sensitivity to applied magnetic fields at 77K and at low and high dc voltages such that magnetic field as low as 6 mT is detected using I-V and I–B measurements. The variation of current with various magnetic field strength at the constant voltage shows also an oscillatory behavior. The sensitivity of this structure to magnetic fields is believed to be due to small nano size of the platinum–copper structures as well as their discrete energy states and the tunneling of carriers into the insulating layer. Our results indicate that this structure may be a good candidate for small, simple, low cost and sensitive low magnetic field detectors.

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Observation of large magnetic resistance in weak magnetic fields using CuPt/SiO2/Si/SiO2/CuPt structure

Cited by 2 publications

References 14 publications

Pt-based composite nanoparticles for magnetic, catalytic, and biomedical applications

Pt-based composite nanoparticles for magnetic, catalytic, and biomedical applications

Low Magnetic Field Detection Using a CuPt Nano Structure Made on a SiO2/Si Structure

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