Magnetic anisotropy in NiFe and Fe/Cu/NiFe multilayers

Citation
Ja. Hutchings et al., Magnetic anisotropy in NiFe and Fe/Cu/NiFe multilayers, J PHYS-COND, 11(17), 1999, pp. 3449-3460
Citations number
18
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF PHYSICS-CONDENSED MATTER
ISSN journal
0953-8984 → ACNP
Volume
11
Issue
17
Year of publication
1999
Pages
3449 - 3460
Database
ISI
SICI code
0953-8984(19990503)11:17<3449:MAINAF>2.0.ZU;2-Q
Abstract
Multilayer samples of Ni/Fe and Fe/Cu/NiFe, fabricated by sputtering and ch aracterized by transmission electron microscopy and electron diffraction, w ere studied by Fe-57 Mossbauer spectra and magnetization measurements. Moss bauer spectra taken in zero applied field at 300 K and 4.2 K showed midlaye r and interface iron sites in Ni(20 Angstrom)/Fe(x Angstrom) samples with x = 20 Angstrom, 30 Angstrom, 50 Angstrom, 80 Angstrom and in-plane spin ori entation. The reorientation of the magnetic moments at 4.2 K in increasing fields applied normal to the layers when combined with magnetization measur ements enabled the magnetic anisotropy energy K of each sample to be evalua ted. The trend of the values of K with iron layer thickness gave volume and interface anisotropy components K-V = (-5 +/- 1) x 10(4) J m(-3) and K-S = (-0.6 +/- 0.4) x 10(-3) J m(-2) where negative values indicate in-plane pr eference. Similar measurements on a series of samples of Fe(30 Angstrom)/Cu (x Angstrom)/Ni(80%)Fe(20%)(30 Angstrom) with x = 10 Angstrom, 20 Angstrom, 30 Angstrom, 50 Angstrom showed a tendency toward increasing in-plane anis otropy energy K with decreasing thickness of the non-magnetic Cu layer.