Shan Che et al 2003 J. Phys.: Condens. Matter 15 L335 doi:10.1088/0953-8984/15/22/101
Shan Che, Jun Wang and Qianwang Chen1
Show affiliationsNanoparticles of barium hexaferrite, with an average size of 12 nm, were prepared by a hydrothermal route at relatively low temperatures (140–180 °C). The effects of reaction temperature and time on the particle size and magnetic properties were discussed. The nanoparticles show a soft magnetic feature with a saturation magnetization of 1.1 emu g−1 and coercivity of 221.0 Oe, rather than the hard magnetic characteristic that the corresponding bulk material exhibits. Annealing treatment in air at 800 °C led to an order-of-magnitude increase of the saturation magnetization (67.3 emu g−1) and coercive force (4511 Oe). It is suggested that the oxygen vacancies should be responsible for the soft magnetic characteristic that appeared for the as-prepared barium hexaferrite nanoparticles.
75.50.Tt Fine-particle systems; nanocrystalline materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
Issue 22 (11 June 2003)
Received 30 April 2003
Published 23 May 2003
Shan Che et al 2003 J. Phys.: Condens. Matter 15 L335
M Kortesniemi et al 2006 Phys. Med. Biol. 51 3269
Paolo Aniello 2009 J. Phys. A: Math. Theor. 42 475210
P K Bera et al 1993 J. Phys. A: Math. Gen. 26 L1073
Y.-Z. Qian and G. J. Wasserburg 2005 ApJ 635 845
Haosheng Lin and Thomas Rimmele 1999 ApJ 514 448
H. R. Schmitt et al. 2002 ApJ 575 150
T Ikari et al 1986 J. Phys. C: Solid State Phys. 19 2633
W Dür and H J Briegel 2007 Rep. Prog. Phys. 70 1381
H M Park and J S Chung 2002 Inverse Problems 18 529