Nature of magnetic ordering in nanocomposites of Zn1-pNipO and NiO

• A detailed study of the nature of magnetic exchange interactions and anisotropy in Zn-1_pNipO/NiO (0 <= p <= 1) two-phase nanocomposites is reported. The exchange constants |J(1)| and |J(2)| have been determined using the molecular field approximation for the two sublattice model which yields |J(2)| similar to 11.26 meV and |J(1)| similar to 7.17meV for p = 1, consistent with type-II antiferromagnetic ordering (i.e. |J2|>>|J(1)|). A novel core-shell surface layer model has been employed to explain the nature of magnetic anisotropy in these nanocomposites which yields anisotropy constants K-surface= 2.42 erg/cm(2), K-bulk = 2.61 x 10(6) erg/cm(3) and K-Shell = 9.56 x 10(5) erg/cm(3) for shell thickness d(Sh) similar to 1.34 nm (p = 1).

Ämnesord

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Nyckelord

Sol-gel process

Nanocomposites

Neel temperature

Anisotropy

Exchange constants2010 MSC

00-01

99-00

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