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Magnetic characteristics of copper ion-modified DNA thin films.

ABSTRACT: We developed a new method of fabricating a divalent copper ion (Cu(2+)) modified DNA thin film on a glass substrate and studied its magnetic properties. We evaluated the coercive field (Hc), remanent magnetization (Mr), susceptibility (?), and thermal variation of magnetization with varying Cu(2+) concentrations [Cu(2+)] resulting in DNA thin films. Although thickness of the two dimensional DNA thin film with Cu(2+) in dry state was extremely thin (0.6?nm), significant ferromagnetic signals were observed at room temperature. The DNA thin films with a [Cu(2+)] near 5?mM showed the distinct S-shape hysteresis with appreciable high Hc, Mr and ? at low field (?600?Oe). These were primarily caused by the presence of small magnetic dipoles of Cu(2+) coordination on the DNA molecule, through unpaired d electrons interacting with their nearest neighbors and the inter-exchange energy in the magnetic dipoles making other neighboring dipoles oriented in the same direction.

SUBMITTER: Dugasani SR

PROVIDER: S-EPMC3650661 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature

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Magnetic characteristics of copper ion-modified DNA thin films.

Dugasani Sreekantha Reddy SR Lee Namhoon N Lee Junwye J Kim Byeonghoon B Hwang Si Un SU Lee Keun Woo KW Kang Won Nam WN Park Sung Ha SH

Scientific reports 20130101

We developed a new method of fabricating a divalent copper ion (Cu(2+)) modified DNA thin film on a glass substrate and studied its magnetic properties. We evaluated the coercive field (Hc), remanent magnetization (Mr), susceptibility (χ), and thermal variation of magnetization with varying Cu(2+) concentrations [Cu(2+)] resulting in DNA thin films. Although thickness of the two dimensional DNA thin film with Cu(2+) in dry state was extremely thin (0.6 nm), significant ferromagnetic signals were ...[more]

PMID: 23660965

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