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标题：Magnetic Characteristics of Copper Ion-Modified DNA Thin Films
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作者：Sreekantha Reddy Dugasani ; Namhoon Lee ; Junwye Lee 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2013
卷号：3
DOI：10.1038/srep01819
出版社：Springer Nature
摘要：We developed a new method of fabricating a divalent copper ion (Cu²⁺) modified DNA thin film on a glass substrate and studied its magnetic properties. We evaluated the coercive field ( H_c ), remanent magnetization ( M_r ), susceptibility ( χ ), and thermal variation of magnetization with varying Cu²⁺ concentrations [Cu²⁺] resulting in DNA thin films. Although thickness of the two dimensional DNA thin film with Cu²⁺ in dry state was extremely thin (0.6 nm), significant ferromagnetic signals were observed at room temperature. The DNA thin films with a [Cu²⁺] near 5 mM showed the distinct S-shape hysteresis with appreciable high H_c , M_r and χ at low field (≤600 Oe). These were primarily caused by the presence of small magnetic dipoles of Cu²⁺ 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.