Nano and micro Hall-effect sensors for room-temperature scanning hall probe microscopy

Date

2004-06-01

Author

SANDHU, A
OKAMOTO, A
SHİBASAKİ, I
Oral, Ahmet

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

156
views

0
downloads

GaAs/AlGaAs two-dimensional electron gas (GaAs-2DEG) Hall probes are impractical for sub-micron room-temperature scanning Hall microscopy (RT-SHPM), due to surface depletion effects that limit the Hall driving current and magnetic sensitivity (B in). Nano and micro Hall-effect sensors were fabricated using Bi and InSb thin films and shown to be practical alternatives to GaAs-2DEG probes for high resolution RT-SHPM. The GaAs-2DEG and InSb probes were fabricated using photolithography and the Bi probes by optical and focused ion beam lithography. Surface depletion effects limited the minimum feature size of GaAs-2DEG probes to similar to1.5 mum(2) with a maximum drive current I-max of similar to3 muA and B-min similar to 0.2 G/rootHz. The B-min of 1.5 mum(2) InSb Hall probes was 6 x 10(-1) G/rootHz at I-max of 100 muA. Further, 200 nm x 200 nm Bi probes yielded good RT-SHPM images of garnet films, with I-max and sensitivity of 40 muA and similar to0.80 G/rootHz, respectively.

Subject Keywords

Hall-effect sensors, Scanning Hall probe microscopy, Magnetic imaging, Ferromagnetic domains

URI

https://hdl.handle.net/11511/34844

Journal

MICROELECTRONIC ENGINEERING

DOI

https://doi.org/10.1016/j.mee.2004.03.029

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

Single layer graphene Hall sensors for scanning Hall probe microscopy (SHPM) in 3-300 K temperature range Sonusen, S.; KARCI, ÖZGÜR; DEDE, MUNIR; Aksoy, S.; Oral, Ahmet (2014-07-30) Graphene micro-Hall probes were developed for a scanning Hall probe microscope system and used for the direct magnetic imaging domains of demagnetized NdFeB permanent magnet for the first time. The Hall coefficient and minimum magnetic field resolution of graphene Hall probes at 1 kHz were found to be 0.18 Omega/G and 0.20 G/root Hz for a drive current of 3 mu A at room temperature in vacuum. The magnetic domains in NdFeB demagnetized magnet were observed at 300K, 126K and 3K successfully.
50 nm Hall sensors for room temperature scanning Hall probe microscopy SANDHU, ADARSH; KUROSAWA, KOUİCHİ; DEDE, MUNIR; Oral, Ahmet (2004-02-01) Bismuth nano-Hall sensors with dimensions similar to50 nm x 50 nm were fabricated using a combination of optical lithography and focused ion beam milling. The Hall coefficient, series resistance and optimum magnetic field sensitivity of the sensors were 4 x 10(-4) Omega/G 9.1 kOmega and 0.8 G/ rootHz, respectively. A 50 nm nano-Bi Hall sensor was installed into a room temperature scanning Hall probe microscope and successfully used for directly imaging ferromagnetic domains of low coercivity garnet thin films.
3D scanning Hall probe microscopy with 700 nm resolution DEDE, MUNIR; AKRAM, RİZWAN; Oral, Ahmet (2016-10-31) In this report, we present a three dimensional (3D) imaging of magnetic field vector (B) over right arrow (x,y,z) emanating from the magnetic material surfaces using a scanning Hall probe microscopy (3D-SHPM) down to a 700 nm spatial resolution. The Hall probe is used to measure B-z(x,y) on the specimen surface at different heights with the step size of Delta z = 250 nm, as we move away from the surface in z direction, until the field decays to zero. These set of images are then used to get partial derivati...
Room temperature magnetic imaging of magnetic storage media and garnet epilayers in the presence of external magnetic fields using a sub-micron GaAs SHPM SANDHU, Adarsh; MASUDA, Hiroshi; Oral, Ahmet; Bending, Simon.J. (2000-09-15) A multipurpose room temperature scanning Hall probe microscope (RT-SHPM) system incorporating an ultra-high sensitive sub-micron GaAs Hall probe (active area of 0.8 0.8 mm2 ; room temperature Hall coefficient of 0.3 O/G) exhibiting extremely high magneticfield sensitivity (0.04G/pHz) was used for the direct, non-invasive and quantitative imaging of magnetic field fluctuations in very close proximity to the surfaces of thin film magnetic storage media, Bi substituted iron garnet epilayers and demagnetized ...
Nanocrystallization in Cu-Zr-Al-Sm Bulk Metallic Glasses Sıkan, Fatih; Yaşar, Bengisu; KALAY, İLKAY (Springer Science and Business Media LLC, 2018-04-01) The effect of rare-earth element (Sm) microalloying on the thermal stability and crystallization kinetics of melt-spun ribbons and suction-cast rods of Zr48Cu38.4Al9.6Sm4 alloy were investigated using differential scanning calorimetry (DSC), X-ray diffraction (XRD), transmission electron microscopy (TEM), and atom probe tomography (APT). The XRD results of constant heating rate annealing indicated that amorphous Zr48Cu38.4Al9.6Sm4 melt-spun ribbons devitrifies into Cu2Sm at 673 K (400 A degrees C). The sequ...

Citation Formats

A. SANDHU, A. OKAMOTO, I. SHİBASAKİ, and A. Oral, “Nano and micro Hall-effect sensors for room-temperature scanning hall probe microscopy,” MICROELECTRONIC ENGINEERING, pp. 524–528, 2004, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/34844.