Magnetic interface anisotropy and magnetization of plated Ni and Co films

Andrä, W.; Danan, H.

doi:10.1002/pssa.2210420124

Cited by 7 publications

(2 citation statements)

References 15 publications

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“…For an exact experimental determination of ysurf from total anisotropic fields H,, corrections must be taken into account for the various different contributions H i (compare Sec. 2) [96]. For Ni films the magnetoelastic fields H,, in particular can have a strong influence on H,.…”

Section: Magnetic Surface and Interface Anisotropiesmentioning

confidence: 99%

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Magnetic Structures and Stresses in Thin Films II. Thermodynamical Treatment and Discussion

Göpel

1978

Ber Bunsenges Phys Chem

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Using a thermodynamic treatment of thin film magnetism, UHV‐experiments on the ferromagnetic resonance of Fe‐, NiFe‐, and Ni‐thin films in the 2– 50 monolayer range can be evaluated. – The discussion of the results about clean surfaces leads to the following conclusions: (a) Magnetic “dead layers” of Ni can be excluded with an accuracy of 0.2 monolayers. b) Results from the spin wave theory are applicable to explain the temperature and thickness dependence of the saturation magnetization of Ni although the films are not ideal on a microscopical scale, c) Magnetic surface anisotropies can be explained by Néel's phenomenological approach, d) Due to the high magnetostriction of Ni the data are affected by mechanical stresses. Therefore mechanical stresses of thin films can be estimated from experimentally determined magnetic anisotropic fields. Tentatively we describe these effects by simple models including stresses from interfacial energies. thermal expansions and grain boundaries. – Chemisorption of H2 and CO on Ni at T±500 K leads to changes in the surface magnetism: a)“Dead layers” are induced by chemisorption. One hydrogen atom diminishes the contribution of one nickel atom to the thin film ferromagnetism. Twice the effect is found for CO adsorption. b) Magnetic surface anisotropies are reduced. c) Mechanical stresses are reduced too. This effect depends on the coverage of chemisorbed particles, the film thickness and the concentration of crystallite boundaries. Only its lower limit can be estimated using a thermodynamic treatment of reduced surface free energies.

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Section: Magnetic Surface and Interface Anisotropiesmentioning

confidence: 99%

“…J/m2 depending on the substrate (quartz [73]. glass [91], Sn/Cu and Pb/Bi [95]), epitaxial Ni/Fe films show differences for Mn-, Cu-, Ag-, or C-coatings [9,10] and results on oxidized Ni and Co films also deviate from Neel's results for clean surfaces [73,120].…”

Section: Magnetic Surface and Interface Anisotropiesmentioning

confidence: 99%

Magnetic Structures and Stresses in Thin Films II. Thermodynamical Treatment and Discussion

Göpel

1978

Ber Bunsenges Phys Chem

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Film growth and magnetic anisotropy of thin Ni electrodeposits on (001) Cu films

Kuriki

1979

Phys. Stat. Sol. (a)

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Thin electrodeposits of Ni prepared on (001) single‐crystal Cu films are studied with an electron microscope. The perpendicular and crystalline anisotropies are also measured using a torque magnetometer. Misfit dislocations are observed from the thinnest deposit thickness (11 Å) examined. The elastic strain determined from spacings of misfit dislocations and moire fringes shows a lower decrease with Ni thickness than for vapor‐deposited films. The measured anisotropy constants 2πM s2 + K⟂ and K1 show strong thickness dependence. When the Cu substrate is removed from the Ni deposit, K⟂ approaches zero and K1 takes the bulk value. Effects of strain through the interaction with magnetostriction are discussed, and the calculated strain from K⟂ agrees reasonably with the strain determined from electron microscopy.

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