Thomas comments on [Link] Physcists say they can encode magnetic data using heat pulses - Less Wrong

0 Post author: MatthewBaker 08 February 2012 08:45AM

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Comment author: Thomas 08 February 2012 08:59:47AM *  1 point [-]

From your link:

Until now it has been believed that in order to record one bit of information – by inverting the poles of a magnet – there was a need to apply an external magnetic field. The stronger the applied field, the faster the recording of a magnetic bit of information.

Technically that is not true. A rotation of a magnet applying some nonmagnetic force was always known as possible and an everyday matter. Still, this is a very good news.

Comment author: shminux 08 February 2012 08:27:12PM 0 points [-]

A rotation of a magnet applying some nonmagnetic force was always known

Can you give an example?

Comment author: Thomas 08 February 2012 08:54:25PM -1 points [-]

A rotating magnet inside an electric generator, for example. It is not a magnetic force which changes the direction of the magnet many times every second.

Comment author: shminux 09 February 2012 03:47:15PM -1 points [-]

That's silly, you are not changing its magnetization, only position. And you are certainly not flipping a single domain inside a magnet in this way.

Comment author: Thomas 09 February 2012 09:43:05PM 2 points [-]

Or, if you prefer this one - Mechanism of surface magnetization by friction of ferromagnetic materials

Comment author: shminux 10 February 2012 03:28:59AM 1 point [-]

That one is indeed interesting, as the magnetic domains are flipped/transferred, albeit not in a controlled way.

Comment author: Thomas 09 February 2012 08:42:57PM 0 points [-]

Then tear apart a magnet! You'll get two magnets. Would you say, that there is no re-magnetization?

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