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English to Korean: For First Time, Researchers Demonstrate Heat and Sound Are Magnetic General field: Tech/Engineering Detailed field: Electronics / Elect Eng
Source text - English Earlier this month, we reported on research demonstrating that heat propagates as a wave through graphene rather than as vibrations of atoms the way it does in 3-D materials. In 3-D materials, the collective state of those vibrating atoms is known as phonons.
For the first time, researchers at Ohio State University (OSU) have demonstrated that acoustic phonons, which can carry both heat and sound, have magnetic properties that allow them to be manipulated with magnetism.
In research published in the journal Nature Materials, the OSU researchers applied a magnetic field equivalent to that inside a magnetic resonance imaging (MRI) device (in this case, the magnet was reported to be fairly powerful at seven Tesla). They discovered that they could reduce the amount of heat flowing through a semiconductor by 12 percent.
“This adds a new dimension to our understanding of acoustic waves,” said Joseph Heremans, professor of mechanical engineering at Ohio State, in a press release. “We’ve shown that we can steer heat magnetically. With a strong enough magnetic field, we should be able to steer sound waves, too.”
Before anyone starts thinking about the discovery’s applicability to heat management in computers, they should keep in mind that the semiconductor had to be kept at temperatures very close to absolute zero (specifically, -268 degrees Celsius) in order for the researchers to measure the movements of the phonons.
* from IEEE Spectrum, By Dexter Johnson, 2015
Translation - Korean 이 달 초에, 그래핀에서 열이 전파될 때의 성질이 3차원 물질에서처럼 원자의 진동이 아닌 파동의 성격을 가진다는 연구를 소개하였다. 3차원 물질에서 원자가 집합적으로 진동하는 상태를 음향 양자라고 일컫는다.
오하이오주립대의 연구진은 이렇게 열과 소리를 전달할 수 있는 음향 양자가 자기적 특성을 가지고 있으며, 자기장을 이용해 조작될 수 있음을 최초로 밝혀냈다.
네이처 지에 발표된 이번 연구에서는, MRI에 쓰이는 것과 비슷한 세기의 자기장을 이용한 결과, 어떤 반도체 물질을 통해 전달되는 열의 양을 12퍼센트까지 줄일 수 있었다.
"이번 연구는 음향 파동에 대한 이해를 한 차원 높인 것입니다." 오하이오 주립대의 조세프 히어만스 교수가 보도자료에서 말한 내용이다. "우리는 열을 자기적으로 조종할 수 있음을 보였습니다. 충분한 자기장이 있다면 소리 또한 조종할 수 있습니다."
장차 이 연구가 컴퓨터의 발열을 관리하는 데에 응용될 수도 있겠지만, 이 연구에서는 음향 양자의 움직임을 측정하기 위해 초저온 상태(섭씨 영하 268도)로 반도체 물질을 유지해야 했음을 기억해야 한다.
* from IEEE Spectrum, By Dexter Johnson, 2015
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