Determining magnetic susceptibilities of everyday materials using an electronic balance

Laumann, Daniel; Heusler, Stefan

doi:10.1119/1.4975588

Cited by 9 publications

(4 citation statements)

References 25 publications

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“…Laumann and Heusler [2] have given a detailed theory for the interaction of a magnet with a magnetic material. Their analysis is presented for forces in a vertical plain whereas the present analysis is for forces in a horizontal plain as shown in figure 1.…”

Section: Theorymentioning

confidence: 99%

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Torsion balance helps identify ferro-, dia- and paramagnetic materials

Thompson

2023

Phys. Educ.

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A neodymium magnet mounted on a torsion balance was placed near samples of ferro- dia- and paramagnetic material held in a plastic container. Similar experiments have used a cotton thread (with no restoring torque) and a pencil as the balance to allow students/pupils to detect the magnetization of many household commodities such as water, Blue-tac, fruit and salt. The present work uses a metallic wire as a suspension which provides a restoring torque due to the elasticity in the wire. Thus, a measurable deflection can be observed when the magnetic and torsion forces balance. For aluminium, the initial negative deflection is a manifestation of Lenz’s law.

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Section: Theorymentioning

confidence: 99%

“…where χ v is the volume susceptibility of the material, µ o is the permeability of free space, (this is equation (6) in [2]). The integration is taken over the whole sample giving: 1 /2 R 2 for the radial integration, 2π for the angular integration and, in the z-direction we have a term…”

Section: Theorymentioning

confidence: 99%

Torsion balance helps identify ferro-, dia- and paramagnetic materials

Thompson

2023

Phys. Educ.

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“…We used a combination of a microbalance (Explorer 2, Ohaus) and a polished pyrolytic graphite as a sensing mechanism, as a variation of experiment conducted by [19]. Each sample was attached to a glass and plastic sample holder facing the graphite and connected the holder using a stiff brass beam with a 3D micro positioner (built in-house with Newport DC servo controllers).…”

Section: Magnetic Forcesmentioning

confidence: 99%

Batch-Fabrication of Diamagnetically Levitated Microrobots

Velez¹,

Pelrine²,

Arnold³

2018

2018 Solid-State, Actuators, and Microsystems Workshop Technical Digest

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This paper reports the batch fabrication of magnetically patterned bases for millimeter-scale, diamagnetically levitated microrobots. A selective-magnetization process is used to imprint checkerboard magnetic pole patterns in a single NdFeB substrate. Further machining of the substrate produces nine microrobots per batch (limited by the surface area of the magnetic substrate). This process represents a leap forward compared to the current fabrication approach, which relies on hand-assembly and gluing arrays of discrete magnets. The diamagnetic repelling forces of bases with two thickness (400 μm and 280 μm) are directly measured (227 μN and 64 μN), showing that the thicker base produced higher force. Furthermore, the microrobots are capable of assisted levitation (external magnetic field bias) and operation in sliding mode (lateral movement) using microfactory drive platform.

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“…Thus, electronic balances are valuable tools in the Physics Laboratory; this experiment has shown that they can be used to determine the density of a material [1] and other workers [2,3] have demonstrated that magnetic measurements can also be carried out.…”

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confidence: 99%