Magnetic Toys

Iron Filing Field Detector

This device and similar ones available from these fine sources: 

From Amazon: BUY NOW Magnetic Field Demonstrator Kits 
From eBay: BUY NOW Magnetic Field Demonstrator Kits 

Iron Filing Field Detector: visualizing the invisible- the magnetic field lines around a dipole bar magnet. In the presence of a magnetic field, ferromagnetic materials (such as iron) temporarily become magnets. Here the iron filings become dipole magnets and link up and align like tiny compass needles to follow and reveal the magnetic field lines associated with the permanent magnet underneath. Viscous silicone oil temporarily keeps the iron particles suspended yet allows for rotation and repositioning under the influence of the magnetic field.

The Levitron

Levitron Tops were produced in the 1990s and are out of production and getting harder to find. Some models are still available here: 
From eBay: BUY NOW 
Levitron Top 

The Levitron: spin stabilized magnetic levitation- will fly for about 3 minutes or more per launch. The spin rate of the magnetic top must be just right for flight, not too fast or too slow. Air resistance and dissipative interactions between the magnets gradually slow the spin rate and the top falls. Interestingly trapping the top requires precision - the weight of the top must be adjusted to within 1 gram to achieve equilibrium between the pull of gravity and the magnetic repulsion from the large donut shaped magnet in the wood base. Repost of my favorite physics toy in my collection.


Electromagnetic Levitation Module 

Get this simple module here:

From EngineDIY: BUY NOW: Mag Lev Kit

Electromagnetic Levitation Module: this bare bones engineered control system uses an adjustable electromagnet (the copper coil) and a Hall effect magnetic field sensor (embedded in the center of the the coil) to levitate a neodymium magnet and keep it from falling. A feedback loop informed by the Hall effect sensors allows fine tuning of the magnetic field to exactly balance the pull of gravity, all powered by a 12 power supply. Once trapped the magnet can also rotate, creating a nice way to display a small piece of kinetic illusion art hanging from a chain. A no frills design that shows the fairly simple circuit and components of such a levitation feedback system. 

Magnetic Poles & Fields

Get a set here: 
From Amazon: BUY NOW Magnetic Field Viewer set 

Viewing Magnetic Poles: visualizing the invisible- tiny iron filings suspended in viscous oil gracefully chain up to reveal the presence of magnetic field lines. Can you determine how the magnetic polls are configured by the structure of the field lines? Here three configurations, initially hidden behind white foam board, create the beautiful mappings of the fields. 


Eclipse Diamagnatic Sculpture

Click here to visit this amazing Etsy shop Element83 
Get a magnetic levitation sculpture here: 
From Etsy: BUY NOW Diamagnetic Levitation Sculptures 

Eclipse diamagnetic levitation sculpture. Cast from diamagnetic Bismuth, a golden spherical neodymium magnet levitates trapped in a tunnel within the metal. Diamagnetic substances only have magnetic fields of their own when placed in an external magnetic field from another source- here the sphere magnet supplies the field. Diamagnetic fields are pretty weak though so a powerful cube neodymium magnet sits above the tunnel and is adjusted to help lift the sphere magnet against gravity. Trapped in equilibrium by these fields, any other magnet brought near will change the balance. 

 

Electromagnetic Levitation Module

Get this kit here (comes complete as shown in my video):
From engineDIY: BUY NOW: Magnetic Levitation Module

The featured sculture is by Bathsheba Grossman, affordable and beautiful math art available here:
From Etsy: BUY NOW: Soliton Sculpture

Electromagnetic Levitation Module: this engineered control system uses adjustable electromagnets (four copper coils) and and two Hall effect magnetic field sensors (held firm embedded in white silicone) to levitate an 5cm diameter neodymium magnet platform about 3 cm in mid-air. A feedback loop informed by the Hall effect sensors allows fine tuning of the magnetic field to exactly balance the pull of gravity, and is powered by a standard USB connection. The platform also rotates, perfect for showcasing one of my metal 3D printed mathematical sculptures by Bathsheba Grossman.