Magnetic and structural properties of Pd/Co/Pd trilayers in hydrogen atmosphere (pressure PH) have been investigated. The Pd layers are well hydrogenated and fully transformed to β-Pd-H phase at PH = 1 atm, but this β phase is distorted along the film normal under the restriction of substrate, and the atomic ratio of H/Pd is estimated to be 0.6. Hydrogenation at low PH gives rise to enhancement of perpendicular magnetic anisotropy Keff. For instance, 3Å-thick Co at PH = 1.3 atm exhibits very high Keff (3.5 × 107erg/cm3) being two times larger than that of as-prepared one (1.6 × 107erg/cm3). Further increase in P(H) decreases Keff gradually, while Keff recovers to some extent after full dehydrogenation.
- Magnetic anisotropy
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics