Theory of room temperature ferromagnetism in Cr modified DNA nanowire


Duru I. P. , DEĞER C. , Eldem V., Kalayci T., AKTAŞ Ş.

JOURNAL OF PHYSICS D-APPLIED PHYSICS, vol.49, no.13, 2016 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 49 Issue: 13
  • Publication Date: 2016
  • Doi Number: 10.1088/0022-3727/49/13/135004
  • Title of Journal : JOURNAL OF PHYSICS D-APPLIED PHYSICS

Abstract

We investigated the magnetic properties of Cr3+ (J < 0) ion-modified DNA (M-DNA) nanowire (1000 base) at room temperature under a uniform magnetic field (similar to 100 Oe) for different doping concentrations. A Monte Carlo simulation method-based Metropolis algorithm is used to figure out the thermodynamic quantities of nanowire formed by Cr M-DNA followed by analysing the dependency of the ferromagnetic behaviour of the M-DNA to dopant concentration. It is understood that ion density/base and ion density/helical of Cr3+ ions can be a tuning parameter, herewith the dopant ratio has an actual importance on the magnetic characterization of M-DNA nanowire (3%-20%). We propose the source of magnetism as an exchange interaction between Cr and DNA helical atoms indicated in the Heisenberg Hamiltonian.