Magnetic imaging of ferromagnetic domains by room temperature scanning hall probe microscopy using GaAs/AlGaAs and bismuth micro-hall probes

Date

2002-01-01

Author

Sandhu, A.
Masuda, H.
Oral, Ahmet
Bending, S.J.
Inushima, T.

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Heterostructure GaAs/AlGaAs and bismuth (Bi) micro-Hall probes were integrated into a room temperature scanning Hall probe microscope system (RT-SHPM) for imaging localized magnetic fluctuations at the surfaces of floppy disks, crystalline garnet thin films, and strontium ferrite permanent magnets. At a drive current of 800 μA the sensitivity of the Bi micro-probes was 0.38 G/√ Hz and comparable with the GaAs/AlGaAs probes. Bi nano-Hall probes with an active region of 200 nm × 200 nm were fabricated by focused ion beam milling and successfully used for magnetic imaging of ferromagnetic domains structures. Bismuth was found to be a practical alternative to semiconductors for fabricating ultra-high resolution nanometer scale Hall probes.

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https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0036405794&origin=inward
https://hdl.handle.net/11511/94280

Conference Name

Physics of Semiconductor Devices

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Department of Physics, Conference / Seminar

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Direct magnetic imaging of ferromagnetic domain structures by room temperature scanning hall probe microscopy using a bismuth micro-hall probe SANDHU, ADARSH; MASUDA, HİROSHİ; Oral, Ahmet; BENDİNG, SİMON J (IOP Publishing, 2001-05-15) A bismuth micro-Hall probe sensor with an integrated scanning tunnelling microscope tip was incorporated into a room temperature scanning Hall probe microscope system and successfully used for the direct magnetic imaging of microscopic domains of low coercivity perpendicular garnet thin films and demagnetized strontium ferrite permanent magnets. At a driving current of 800 muA, the Hall coefficient, magnetic field sensitivity and spatial resolution of the Bi probe were 3.3 x 10(-4) Omega /G, 0.38 G/root Hz ...
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Citation Formats

A. Sandhu, H. Masuda, A. Oral, S. J. Bending, and T. Inushima, “Magnetic imaging of ferromagnetic domains by room temperature scanning hall probe microscopy using GaAs/AlGaAs and bismuth micro-hall probes,” Delhi, Hindistan, 2002, vol. 4746 II, Accessed: 00, 2021. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0036405794&origin=inward.