Measurement of diamagnetic susceptibility with permanent magnet

Akira NAGATA; Yusuke KAMINO; Hiraku TODA

Presentation information

Poster

Symbol O (Public) » Public

[O-04_29PO1] Poster presentations by senior high school students

Tue. Apr 29, 2014 1:45 PM - 3:15 PM Poster (3F)

Senior high school students show poster presentations on topics in fields of earth and planetary science. We provide an opportunity for senior high school students to give their presentations in the conference and to have discussions with them. This session has been presented as a public outreach session since 2006. The JpGU Publicity and Outreach Committee members are conveners of this session.

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2:45 PM - 3:15 PM

[O04-P23] Measurement of diamagnetic susceptibility with permanent magnet

*Akira NAGATA¹, *Yusuke KAMINO¹, *Hiraku TODA¹ (1.Kasugaoka High-school of Osaka prefecture, The evening course)

Keywords:地質,岩石,化石,測定法開発,鉱物同定

【概要】
一般に磁石に反応しないと思われている物質も，非常に弱いながら磁気活性をもつ．反磁性物質の非常に小さい磁化率を，重力と磁場勾配力を直交させることで，永久磁石レベルの弱い磁場で計測できる装置を考案し製作した．試料にかかる磁場勾配力と重力と吊した糸の張力の３力のつりあいを利用し磁化率を求めた．磁石を平行に向かい合わせた磁気回路を用いて，磁場勾配力が極大になる点を一意的に決定できた．6種類の反磁性物質の磁化率を2桁に渡り測定したところ，ほぼ文献値に一致し，この装置が10-7emu/gレベルの反磁性磁化率を測定できることを検証した．今後，測定精度を上げることにより，岩石中の鉱物を同定することができると見込まれる．