Orbital magnetic moments of Co in multilayers with perpendicular magnetic anisotropy

Journal Article · Sun May 01 00:00:00 EDT 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.49.12888· OSTI ID:6653775

Weller, D; Wu, Y; Stoehr, J; Samant, M G ^[1]; Hermsmeier, B D ^[2]; Chappert, C ^[3]

---

1. IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120 (United States)
2. IBM San Jose, 5600 Cottle Road, San Jose, California 95153 (United States)
3. Institut d'Electronique Fondamentale, Batiment 220, Universite Paris-Sud, 91405 Orsay (France)

The out-of-plane orbital magnetic moment of Co in Co/[ital X] multilayers ([ital X]=Pd, Pt, and Ni) with perpendicular magnetic anisotropy has been investigated using x-ray magnetic-circular-dichroism spectroscopy. The orbital [ital d] moment per Co atom, [ital m][sub orb][sup [perpendicular]], is considerably enhanced by (0.15[plus minus]0.02)[mu][sub [ital B]] and (0.07[plus minus]0.02)[mu][sub [ital B]] in Co/Pd and Co/Pt multilayers, respectively, compared with a single thick Co film. No respective enhancement is found in the case of Co/Ni. This enhancement does [ital not] scale with the spin-orbit coupling parameter [xi][sub SO] of Ni-3[ital d], Pd-4[ital d], and Pt-5[ital d] bands despite strong [ital d]-[ital d] mixing which leads to the presence of ferromagnetic moments of Pd and Pt atoms. However, a roughly linear scaling relation of the out-of-plane orbital moment [ital m][sub orb][sup [perpendicular]] with the intrinsic uniaxial anisotropy constant [ital K][sub [ital u],1][sup Co] per Co volume is observed. This experimental finding is interpreted in conjunction with recent [ital ab] [ital initio] and tight-binding band-structure calculations as evidence for a preferential enhancement of the out-of-plane orbital moment of Co in Co/Pd and Co/Pt multilayers.

• OSTI ID: 6653775
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 49:18; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
CHEMICAL REACTIONS
CHEMISORPTION
COBALT
DATA
ELEMENTS
FILMS
INFORMATION
MAGNETIC MOMENTS
MAGNETIZATION
MAGNETO-OPTICAL EFFECTS
METALS
NICKEL
NUMERICAL DATA
PALLADIUM
PLATINUM
PLATINUM METALS
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
THEORETICAL DATA
THIN FILMS
TRANSITION ELEMENTS