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Dive into the research topics where I. Panagiotopoulos is active.

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Featured researches published by I. Panagiotopoulos.


Physical Review B | 1999

Structural and magnetic properties of La 0.67 ( Ba x Ca 1 − x ) 0.33 MnO 3 perovskites ( 0 x 1 )

N. Moutis; I. Panagiotopoulos; M. Pissas; D. Niarchos

The magnetic critical behavior in the series


Journal of Applied Physics | 2000

CoPt and FePt thin films for high density recording media

J. A. Christodoulides; Y. Huang; Y. Zhang; G. C. Hadjipanayis; I. Panagiotopoulos; D. Niarchos

{\mathrm{La}}_{0.67}({\mathrm{Ba}}_{x}{\mathrm{Ca}}_{1\ensuremath{-}x}{)}_{0.33}{\mathrm{MnO}}_{3}


Applied Physics Letters | 1998

CoPt/Ag nanocomposites for high density recording media

S. Stavroyiannis; I. Panagiotopoulos; D. Niarchos; J. A. Christodoulides; Y. Zhang; G. C. Hadjipanayis


Journal of Magnetism and Magnetic Materials | 1996

'Exchange spring' behavior in nanocomposite hard magnetic materials

I. Panagiotopoulos; L. Withanawasam; G. C. Hadjipanayis

(0l~xl~1)


Applied Physics Letters | 2001

CoPt/Ag nanocomposites with (001) texture

V. Karanasos; I. Panagiotopoulos; D. Niarchos; H. Okumura; G. C. Hadjipanayis

of manganese perovskites is studied by means of dc magnetic measurements. In this series the


Journal of Applied Physics | 2006

Weak ferromagnetism and exchange biasing in cobalt oxide nanoparticle systems

Aphrodite Tomou; Dimitrios Gournis; I. Panagiotopoulos; Y. Huang; G. C. Hadjipanayis; B.J. Kooi

{\mathrm{Mn}}^{4+}{/\mathrm{M}\mathrm{n}}^{3+}


Journal of Applied Physics | 1999

New CoPt/Ag films for high density recording media

S. Stavroyiannis; I. Panagiotopoulos; D. Niarchos; J. A. Christodoulides; Y. Zhang; G. C. Hadjipanayis

ratio is kept constant while Ca ions are substituted by the larger Ba ions resulting in structural changes accompanied by an increase of the transition temperature from 265 to 340 K. Samples with


Applied Physics Letters | 2006

Magnetoresistance switch effect in a multiferroic Fe3O4∕BaTiO3 bilayer

M. Ziese; A. Bollero; I. Panagiotopoulos; N. Moutis

xl~0.4


ieee international magnetics conference | 2002

High coercivity in boron substituted Sm-Co melt-spun magnets

Sofoklis S. Makridis; G. Litsardakis; I. Panagiotopoulos; Dimitrios Niarchos; Y. Zhang; G. C. Hadjipanayis

crystallize in the orthorhombic


Journal of Applied Physics | 2000

Granular CoPt/C films for high-density recording media

I. Panagiotopoulos; S. Stavroyiannis; D. Niarchos; J. A. Christodoulides; G. C. Hadjipanayis

\mathrm{Pnma}

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Dimitrios Niarchos

Nuclear Regulatory Commission

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D. Niarchos

Argonne National Laboratory

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A. Markou

University of Ioannina

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Sofoklis S. Makridis

University of Western Macedonia

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