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3D scanning Hall probe microscopy with 700 nm resolution
Date
2016-10-31
Author
DEDE, MUNIR
AKRAM, RİZWAN
Oral, Ahmet
Metadata
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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
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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.