Magnets can control heat and sound

US scientists discovered, we can use magnets to control both heat and sound.

Use magnets to control heat and sound

New research by experts from Ohio University (USA) shows that photons - fundamental particles that transmit both heat and sound, can be attracted by magnets . This implies, we can use a strong magnetic field to drive the direction and control the sound waves in the future.

According to experts, heat and sound are basically the same form of energy , converging around the vibrations of atoms. So by sound control, you can often control both the heat and vice versa.

The Nature Materials magazine reported that, with the support of the Army's Research Office, the Air Force Scientific Research Office and the National Science Association of America, the research team led by expert Jin Hyungyu Using a strong magnetic field equivalent magnetic field emitted from a medical magnetic resonance imaging (MRI) machine to reduce 12% of hot heat can run through a semiconductor.

Illustrative image of a phonon (atomic) heating up a solid material.

In the experiment, the team used a semiconductor indium antimonide-shaped rod , with two branches 4mm and 1mm wide. They attached heat transfer sources to the ends of both semiconductor rods, and cooled it to -268 degrees C to slow down the motion of atoms in semiconductors.

The low temperature in the synonymous experiment, the size of the semiconductor sample used for testing is as important as the constituent atoms. A larger sample can transmit heat faster than smaller samples, so the larger branch of the adjustable disc can transmit more heat faster.

Experts measured the thermal variation in both branches of the adjustable plate in turn when they switched on and off the strong magnetic field of 7 tesla, the field-level equivalent of the MRI machine. The results revealed, when disabling the magnetic field, the branch was larger and the adjustable disk conveyed more heat than the smaller branch as conjectured. However, when the magnetic field turns on, the amount of heat flowing through the large branch is reduced by 12%.

The team discovered that the magnetic field caused some phonons to pass through the semiconductor oscillating "rhythm error" and collide with each other . In larger branches where more collisions occur because of large areas, more phonons are lost and less heat is transmitted.

Experts conclude that phonons are definitely magnetic. They say, we can use magnetism to control heat and sound in substances like glass and plastic, if we find a strong enough magnet.