Magnetic patterning of chemically-ordered CrPt3 films

Hellwig, O Weller, D Kellock, AJ Baglin, JEE Fullerton, EE

O. Hellwig et al., Magnetic patterning of chemically-ordered CrPt3 films, APPL PHYS L, 79(8), 2001, pp. 1151-1153

12

INGLESE

Article

Apllied Physucs/Condensed Matter/Materiales Science

APPLIED PHYSICS LETTERS

0003-6951 → ACNP

79

8

2001

1151 - 1153

ISI

0003-6951(20010820)79:8<1151:MPOCCF>2.0.ZU;2-2

We report magnetic patterning of ferrimagnetic CrPt3 films by locally suppr essing the magnetic order using ion-beam irradiation. Chemically-ordered Cr Pt3 films grown on MgO(110) single-crystal and amorphous SiNx substrates ar e ferrimagnetic and exhibit strain-induced uniaxial magnetic anisotropy. X- ray diffraction confirms the formation of the L1(2) phase and magneto-optic al Kerr effect spectroscopy reveals the theoretically expected dependence o f Kerr rotation and ellipticity on photon energy. Irradiation of the films with 700 keV N+ ions at doses greater than or similar to 6x10(16) ions/cm(2 ) transforms the chemically-ordered CrPt3 ferrimagnetic alloy into the chem ically-disordered nonmagnetic fcc phase. As a result, ordered CrPt3 layers can be patterned into magnetic and nonmagnetic regions and are candidate ma terial for ion-beam-patterned magnetic recording media. (C) 2001 American I nstitute of Physics.