Magnetic Field Mapping

Many magnet applications use permanent magnets or electromagnets to provide a magnetic field for an attractive or repulsive interaction. Magnetic field data is required for product designs and applications where product function is based upon magnetic strength, the magnetized pole geometry, the external field shape, and magnitude at the working distance(s) in the application. A magnetic field map can provide the effective magnetic field characteristics of application magnet(s).

ARkival performs field mapping measurements to determine magnetic field forces, field directions and distributions, and magnetic edge effects. Planar-probes or edge-directed Hall probes are used with a custom designed micrometer measurement mapping fixture to provide 3Dimensional micrometer and/or robotic-stepped planar field maps. The resulting field maps provide both the shape and magnitude of the magnetic field at different points and in 3 planar surfaces as well as at varying distances from the primary magnetic source.

Field Measurements & Distance mapping

Magnetic field data can be collected in 1, 2 or 3 data planes (X, Y & Z) at both the magnet center and magnet edges. The application magnets are positioned in a non-magnetic stand custom-machined for these measurements. The Hall-effect probes are mounted in a 3D micrometer
station providing accurate dimensional stepping in 3-planar directions. All Hall-effect probes are periodically calibrated with 2+ traceable, reference magnets throughout the measurement collection.

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ARkival’s Magnetic Thermal Annealing (MTA) process is used to enhance the performance of  magnetic materials and components. During their manufacture, preparation and processing the crystalline and magnetic  structures of these materials can assume moderate to high degrees of disorder.  The process of controlled  magnetic thermal annealing can remove these disorders and can often provide substantially improved magnetic performance of the materials and even their devices (e.g., spintronic devices).

The heating of a magnetic material above its recrystallization temperature in a magnetic field and then cooling in the field will allow atom migration within the crystal lattice such that the number of dislocation sites decreases, leading to the change in magnetic properties and at times, their ductility and hardness.

Magnetic materials such as  metals (in different shapes and forms… wires, foils, and plates), powders and thin films can be thermally treated in temperatures up to 900˚C  in a uniform magnetic field (as high as 2.5 Tesla) and in an inert gas environment for MTA processing.

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MFM is a magnetic measurement technology for imaging various magnetic structures including magnetic domains, domain walls (Bloch and Neel), recorded magnetic bits and magnetic surface structures and abnormalities. MFM studies are performed with and/or without the presence of an external magnetic field.

MFM imaging of various materials such as thin films, nanoparticles, nanowires, permalloy disks and recording media are commonly performed. This technology does not require the sample to be electrically conductive and measurements are performed at ambient temperature, in ultra-high vacuum (UHV), or in a liquid environment, at different temperatures, and in the presence of external magnetic fields.

The Measurement is nondestructive to the crystal lattice or structure and is typically insensitive to minor surface contamination. No special surface preparation or coating is required.

Samples are usually scanned twice. The first scan of the surface presents the topography of the sample. In secondary scans, the magnetic tip-sample distance is increased and when scanned along the initial topography line and is only affected by the magnetic forces. The signals are electronically configured to obtain the MFM image.

This form of cantilever magnetometry (MFM) can also be used for characterizing magnetic samples and as technique to characterize the magnetic properties of materials and measure the magnetic dissipation in magnetic materials. The magnetization of individual magnetic nanoparticles (MNP) can also be determined with MFM for applications in nano-magnetism used for pharma-delivery, MRI diagnostics, and biotechnology.

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Magnetic field data from magnets or magnetized materials can be collected in 1, 2 or 3 data planes (X, Y & Z) at both the magnet center and magnet edges. The application magnets are positioned in a non-magnetic test stand custom-machined for these measurements. The Hall-effect probes are mounted in a 3D micrometer station or robotic fixture for providing accurate dimensional stepping in 3-planar directions. All Hall-effect probes used are periodically calibrated with several traceable reference magnets throughout the measurement and data collection.

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The post Magnet Field Measurements & Magnetic Field Distance Mapping appeared first on ARkival Technology Magnetics Lab.