# Ferromagnetism (DD-260)

> Ferrofluid is a liquid containing nanoscale magnetic particles, usually magnetite, coated with a surfactant and suspended in a carrier such as oil. It was invented in 1963 by Steve Papell at NASA as a way to move rocket fuel in weightlessness. In a strong magnetic field the liquid forms spikes, an effect called the normal-field instability. Ferrofluids are used as seals around spinning shafts, including in hard drives, and to cool and damp loudspeakers. The footage shows ferrofluid spiking and flowing, with the presenter.

- Department: Science
- First published: 2024-06-28
- Last updated: 2024-06-28
- Permalink: https://detailenjoyer.com/case/ferromagnetism/
- Original Reel title: Ferromagnetism 🧲
- Author: Marcus Easterling (DetailEnjoyer), The Detail Department

## On the timeline

- **1963**: Steve Papell invents ferrofluid at NASA

Full timeline: https://detailenjoyer.com/timeline/?case=ferromagnetism

## Quick facts

- **DD-260-F01**: Ferrofluid holds magnetic nanoparticles. _(Write-up · Exhibit A (Nanoparticles))_
- **DD-260-F02**: Steve Papell invented it at NASA in 1963. _(Write-up · Exhibit B (1963))_

## Write-up

Ferrofluid grows spikes near a magnet. NASA researchers invented it in the 1960s.

1. **Nanoparticles**: Ferrofluid holds magnetic nanoparticles.
2. **1963**: Steve Papell invented it at NASA in 1963.
3. **Rocket fuel**: It was meant to move fuel in weightlessness.
4. **Spikes**: A magnet makes it form spikes.
5. **Seals**: It is used in seals and speakers.

## Related case files

- [Earth (DD-131)](https://detailenjoyer.com/case/earth/): I linked a planet-sized magnet

## Reel vs. record

- **Note**: None needed.

## Video: Ferromagnetism: Ferrofluid Grows Spikes Near a Magnet

- Duration: 32.9 s · Published: 2024-06-28
- File: https://detailenjoyer.com/assets/videos/C8xEfiiJTYA.mp4

### Transcript

DID YOU KNOW? ferrofluid is a fascinating liquid that becomes strongly magnetized in the presence of a magnetic field. Invented by NASA in the 1960s for use in rocket fuel systems, ferrofluids are composed of tiny magnetic particles suspended in a carrier fluid. When exposed to a magnetic field, the particles align along magnetic lines of force, creating visually striking patterns that look like spikes. Beyond their mesmerizing visual effects, ferrofluids have practical applications in various fields, including as seals and hard drives, in medical devices, and in mechanical engineering to reduce friction. Their unique properties make them a subject of interest for both scientific research and artistic creation. NOW YOU KNOW!

## Questions & answers

**Q: What is in ferrofluid?**  
A: In oil. _(Source: Write-up · Exhibit A (Nanoparticles) · Wikipedia: Ferrofluid)_

**Q: Who invented it?**  
A: 1963. _(Source: Write-up · Exhibit B (1963) · Wikipedia: Ferrofluid)_

**Q: Why was it invented?**  
A: Microgravity. _(Source: Write-up · Exhibit C (Rocket fuel) · Wikipedia: Ferrofluid)_

**Q: What happens near a magnet?**  
A: Normal-field instability. _(Source: Write-up · Exhibit D (Spikes) · Wikipedia: Ferrofluid)_

**Q: Where is it used?**  
A: Including hard drives. _(Source: Write-up · Exhibit E (Seals) · Wikipedia: Ferrofluid)_

## Sources

- [Wikipedia: Ferrofluid](https://en.wikipedia.org/wiki/Ferrofluid)

## Cite this case file

Easterling, Marcus. "Ferromagnetism." The Detail Department (DetailEnjoyer), case file DD-260, last updated Jun 28, 2024. https://detailenjoyer.com/case/ferromagnetism/