The effect of chemical etching on the surface relief of NiFe and NiFeCo films and their magnetic parameters is studied. Electron micrograph analysis shows that during the etching inhomogeneities in the film thickness appear with a period of about 1000 A and an amplitude of the thickness fluctuations of about 100 A. This process goes along with the increase of the angular amplitude of the magnetization ripple and coercivity and is well described by Hoffmann's theory. The coercive force component stipulated by pinning of the domain walls on localized defects does not change significantly during the etching. Der EinfluD des chemischen Atzvorgangs auf das Oberflachenrelief und die magnetischen Parameter von NiFe-und NiFeC0:Schichten wird untersucht. Elektronenmikroskopische Untersuchungen zeigten, daD beim Atzen Schichtdickeninhomogenitaten mit einer Periode von ca. 1000 A und Dickenanderungen von etwa 100 A entstehen. Dieser Vorgang ist begleitet von einem Anwachsen der Ripple-Winkelamplitude und der Koerzitivitat. Er 1aBt sich mit der Hoffmannschen Theorie gut beschreiben. Die durch das Haften der Befeichsgrenzen an ortsfesten Fehlstellen bedingte Koerzitivkraftkomponente zeigt wahrend des Atzens keine merkliche Veranderung.

Domain-wall creep was studied by the powder pattern method. To increase the resolution of the boundary pictures, microphotometry of the photographs was made. The centre of the boundary on the film was determined to a n accuracy of & 0.05 pm. The direct observation of elementary acts of creep enables to substantiate and refine the kinematic creep model -the model of varying boundary curvature. The curvature variation is due to the variation in the boundary rigidity as a result of the inductionof magnetostatic "charges".Das Kriechen von Domanenwanden wurde mit der Pulverdiagrammethode untersucht. Um die Auflosung der Bilder der Grenzen zu erhohen. wurden die Diagramme mikrophotometrisch ausgewertet. Das Zentrum der Grenze auf dem Film wurde mit einer Genauigkeit von &0,05 pm bestimmt. Die direkte Beobachtung der Elementarakte des Kriechens erlaubt, das kinematische Kriechmodell das Model1 der variierenden Grenzkurvenformen -zu erharten und zu verbessern. Die Anderung der Kurvenform wird durch die Anderung der Grenzstabilitat als Ergebnis einer Induktion magnetostatischer ,,Ladungen" verursacht.

The coercivity HW of a flexible domain wall is calculated considering various mechanisms of domain wall volume and surface pinning such as intergrain boundaries, easy axes angular fluctuations of crystallites, substrate and thin magnetic film surface roughnesses. The HW dependence on thickness D is stipulated chiefly by surface domain wall pinning. Comparison of experimental and calculated HW(D) reveals the contribution of volume and surface inhomogeneities.

Three mechanism of the effect of a copper layer on the coercive force of films are studied in this work: variation in the "roughness" of the substrate; diffusion of the copper into the permalloy; variation in the energy of exchange interaction between permalloy films eeparated by a copper layer. It is found, that an increment of the coercive force (AH,) with time is directly proportional to the effective diffusion depth, Ad. The results of experimental investigations on the condensation of metallic film make i t possible to single out the following stages of this process: the formation of stable nuclei, the coalescence of discrete nuclei to a continuous layer; the growth of crystallites with a further increase of the thickness of continuous films. Observation of structures of interlayers under an electron microscope indicates that in wide ranges of thickness and deposition temperatures the interlayer consists of individual stable nuclei. The presence of exchange interaction between separated magnetic layers due t o their direct contact makes i t possible to explain the experimental results.