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  Sci. Lett. J. 2015, 4: 83  
  Research Article
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Frequency-adapted crossover from para-to-dia magnetization in an Ising-like dipole-dipole model  
  Nilangshu K. Dasa,c, P. Barata, Sounak Deyb, T. Jayakumarc  
a Variable Energy Cyclotron Centre, Kolkata-700064, India
b Indian Statistical Institute, Kolkata-700108, India
c Indira Gandhi Centre for Atomic Research, Kalpakkam-603102, India

  The aggregation of interacting nano-magnetic dipoles, demostrate both experimentally and theoretically as a model system to detect intriguing co-operative physical phenomena. Here we show a crossover from paramagnetic to diamagnetic state by changing the frequency of the applied sinusoidal magnetic field for an ensemble of nano-magnets. This phenomenon unravels an insight of physics and it may be significant on the design and development of magnetic devices.  
  Nano-magnetism; Cooperative phenomena; Magnetic memories; Magnetic anisotropy  
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