Influence of substrate on the magnetic properties of Ni and permalloy sub-micrometric patterned stripes

DUQUE, J. G. S.; ROSA, W. O.; NUNES, W. C.; DE ARAÚJO, A. E. P.; PAGLIUSO, P. G.; CESCATO, L.; KNOBEL, M.; SOCOLOVSKY, L. M.; ZYSLER, R.

Journal of Physics - D (Applied Physics)

IOP Publishing

Año: 2010 vol. 43 p. 1 - 4

0022-3727

The magnetic properties of sub-micrometric magnetic structures of Ni and permalloy(Ni80Fe20) patterned stripes are studied as functions of temperature. The samples are producedby combining an interferometric lithographic technique with sputtering. At room temperature,ferromagnetic resonance and hysteresis data indicate the existence of an in-plane uniaxialanisotropy in both samples. The NiFe sample has an easy axis along the stripes direction in theentire studied temperature range (2 < T < 300 K). On the other hand, an interesting change inthe easy magnetization direction is observed in Ni samples, from parallel to perpendicular tothe axis of the stripes, when the temperature is decreased. The results are interpreted in termsof a competition between shape and magnetoelastic anisotropies.