Abstract
In a previous paper a method has been described to produce thin films of amorphous iron by simultaneous condensation of iron and small additions of oxygen, silicon, or germanium onto a substrate at 20 °K. During annealing the amorphous films crystallize within a narrow range of temperature.
In this paper the magnetic properties of these films are investigated. By a new lowtemperature άgnetometer the magnetization curves can be registered for the different states of annealing. It results that even in the amorphous state iron is ferromagnetic. Below a critical concentration of the oxygen, silicon, or germanium admixtures the magnetic moment of the iron atoms is smaller and the coercive force is greater in the amorphous than in the crystalline structure. Above that concentration the magnetic moments in the two structures are equal, whereas the coercive force of the amorphous films is smaller than that of the crystalline ones.
The results are explained by a concentration depending short range order in the amorphous films.
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Meinem hochverehrten Lehrer, Herrn Prof. Dr. R.Hilsch, danke ich für die Anregung zu dieser Arbeit und ihre ständige, intensive Förderung. Herrn Dr. D.Korn bin ich für viele nützliche Ratschläge und zahlreiche Diskussionen sehr zu Dank verpflichtet. Herrn Akad. Rat Dr. H.Gründig danke ich für wertvolle praktische Hinweise. Die Durchführung der Arbeit wurde in dankenswerter Weise durch Mittel der Göttinger Akademie der Wissenschaften und der Deutschen Forschungsgemeinschaft unterstützt.
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Felsch, W. Ferromagnetismus von amorphem Eisen. Z. Physik 219, 280–299 (1969). https://doi.org/10.1007/BF01397570
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DOI: https://doi.org/10.1007/BF01397570