3D scanning Hall probe microscopy with 700 nm resolution

Date

2016-10-31

Author

DEDE, MUNIR
AKRAM, RİZWAN
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

255
views

0
downloads

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 derivative B-z(x,y)/partial derivative x and partial derivative B-z(x,y)/partial derivative y at different z by numerical differentiation. Using the Maxwell's equations in the source free region, B-x(x,y) and B-y(x,y) can be calculated by integrating partial derivative B-z(x,y)/partial derivative x and partial derivative B-z(x,y)/partial derivative y in the z direction. Alternatively, the gradients can also be measured in the Hall gradiometer configuration directly. The operation of the 3D-SHPM is demonstrated by imaging B-x(x,y), B-y(x,y) and B-z(x,y) on a hard disk specimen at a 700 nm resolution, using both of these methods at 77 K. The system is capable of operating from 300 K down to 4 K range. Published by AIP Publishing.

Subject Keywords

ELECTRON-BEAM TOMOGRAPHY, NEGATIVE BEND RESISTANCE, SI/SIGE CROSS JUNCTION, EFFECT DEVICE, SENSOR, RECONSTRUCTION, CATALYSTS, SYSTEMS

URI

https://hdl.handle.net/11511/34513

Journal

APPLIED PHYSICS LETTERS

DOI

https://doi.org/10.1063/1.4966896

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

Electrical impedance tomography using the magnetic field generated by injected currents Birgul, O; Ider, YZ (1996-11-03) In 2D EIT imaging, the internal distribution of the injected currents generate a magnetic field in the imaging region which can be measured by magnetic resonance imaging techniques. This magnetic field is perpendicular to the imaging region on the imaging region and it can be used in reconstructing the conductivity distribution inside the imaging region. For this purpose, internal current distribution is found using the finite element method. The magnetic fields due to this current is found using Biot-Savar...
Scanning Hall Probe Microscopy (SHPM) using quartz crystal AFM feedback Dede, M.; Uerkmen, K.; Girisen, Oe.; Atabak, M.; Oral, Ahmet; Farrer, I.; Ritchie, D. (American Scientific Publishers, 2008-02-01) Scanning Hall Probe Microscopy (SHPM) is a quantitative and non-invasive technique for imaging localized surface magnetic field fluctuations such as ferromagnetic domains with high spatial and magnetic field resolution of similar to 50 nm and 7 mG/Hz(1/2) at room temperature. In the SHPM technique, scanning tunneling microscope (STM) or atomic force microscope (AFM) feedback is used to keep the Hall sensor in close proximity of the sample surface. However, STM tracking SHPM requires conductive samples; ther...
Magnetic Resonance Imaging in Inhomogeneous Magnetic Fields with Noisy Signal Arpinar, V. E.; Eyüboğlu, Behçet Murat (2008-11-27) In this study, an image reconstruction algorithm for a Magnetic Resonance Imaging (MRI) system with inhomogeneous magnetic fields is proposed. The proposed reconstruction algorithm uses spatial distributions of main magnetic field, Radio Frequency (RF) and gradient fields as inputs, together with the pulse sequence and the noisy Magnetic Resonance (MR) signal. To calculate the noise signal, noise model for MRI with homogeneous fields is extended for inhomogeneous magnetic fields. Using this embedded noise m...
Spatial modulation of THz beams for imaging applications Altan, Hakan (null; 2015-10-16) Techniques based on compressive sensing allow us to image fields at faster rates and at our labs in METU we have been experimenting with imaging based on spatial modulation of THz beams using single pixel detectors [1]. However these studies are based on discrete patterns using metal sheets. These techniques would benefit greatly if we could modulate the THz field. For example, optical modulators play a key role in optoelectronics and communication systems. Electro-optic, acousto-optic and thermo-optic effe...
Image Reconstruction in Magnetic Resonance Conductivity Tensor Imaging (MRCTI) DEĞİRMENCİ, EVREN; Eyüboğlu, Behçet Murat (2012-03-01) Almost all magnetic resonance electrical impedance tomography (MREIT) reconstruction algorithms proposed to date assume isotropic conductivity in order to simplify the image reconstruction. However, it is well known that most of biological tissues have anisotropic conductivity values. In this study, four novel anisotropic conductivity reconstruction algorithms are proposed to reconstruct high resolution conductivity tensor images. Performances of these four algorithms and a previously proposed algorithm are...

Citation Formats

M. DEDE, R. AKRAM, and A. Oral, “3D scanning Hall probe microscopy with 700 nm resolution,” APPLIED PHYSICS LETTERS, pp. 0–0, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/34513.