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Magnetic Susceptibility and Permeability

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...

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Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

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Published on: June 9, 2016

On-Chip Planar Metasurfaces for Magnetic Sensors with Greatly Enhanced Sensitivity.

Aleix Barrera¹, Emile Fourneau², Natanael Bort-Soldevila³

¹Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus de la UAB, Bellaterra 08193, Spain.

|March 6, 2025

Summary

Engineered magnetic metamaterials, specifically permalloy (Py) metasurfaces, can significantly enhance the sensitivity of Cobalt (Co) magnetic sensors. This breakthrough offers a two-orders-of-magnitude improvement for magnetic functional devices.

Keywords:

magnetic flux concentrators magnetic sensors metamaterials metasurfaces micromagnetism

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

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Published on: July 20, 2022

Area of Science:

Condensed Matter Physics
Materials Science
Nanotechnology

Background:

Metamaterials with engineered structures are known for manipulating waves (optical, acoustic, thermal).
Magnetic metamaterials, with precisely arranged elements, can control magnetic fields.
Soft-magnetic permalloy (Py) metasurfaces offer potential for local tailoring of magnetic properties.

Purpose of the Study:

To demonstrate the use of Py metasurfaces for tailoring magnetic properties of other structures.
To investigate the magnetic response of a Cobalt (Co) sensor bar within a Py metasurface.
To enhance the sensitivity of magnetic sensors using engineered metamaterials.

Main Methods:

Investigated the magnetic response of a Co sensor bar using the planar Hall effect under in-plane magnetic fields.
Utilized micromagnetic simulations coupled with magneto-transport equations.
Employed X-ray photoemission electron microscopy (XPEEM) with magnetic circular dichroism (XMCD) for analysis.

Main Results:

Py metasurfaces significantly adjust the coercive field and susceptibility of the Co sensor bar.
Achieved an enhancement in sensor sensitivity exceeding 2 orders of magnitude.
Simulations and experimental measurements accurately captured the observed magnetic effects.

Conclusions:

Specifically designed Py metasurfaces can locally tailor the magnetic properties of Co sensor bars.
This approach leads to a substantial enhancement in magnetic sensor sensitivity.
Findings pave the way for improved performance and versatility in magnetic functional devices.