Influence of demagnetization in remanence curves of magnetic thin films
Remanent magnetization curves of perpendicular magnetic thin films are simulated and measured. The simulations are used to investigate the theoretical influence of the strong demagnetizing field present in these films. Conclusions are drawn from this on how remanence curves should be measured and how they should be corrected for the demagnetizing influence. The experimental part consists of measurements on Fe‐Alumite, Co‐Pt–based multilayers, and Co‐Cr. In addition the latter material is also artificially patterned into microstrips in order to investigate the influence of demagnetization on remanence curves experimentally.
Enhancement of the remanence and coercivity in Co-Cr layers
Abstract An enhancement of the remanent magnetisation and of the coercivity of Co-Cr layers is observed after applying a magnetic field which does not saturate the sample compared to measurements after saturating the sample. An enhancement of the remanent magnetisation up to 35% is observed by measuring remanence curves. A similar effect can be observed by measuring minor hysteresis loops. This effect can be explained by allowing the domain period to be an independent parameter in the Kooy and Enz model. This effect decreases with increasing coercivity of Co-Cr layers prepared at different substrate temperatures. This is a new indication that Co-Cr layers gradually change from a continuous medium to a more particulate-like medium with increasing coercivity.
On the Theory of Double Bloch Walls in Thin Films
The paper gives a theory of the double Bloch walls observed by Williams and Sherwood in thin ferromagnetic films. The stability of these walls as a function of the thickness of the film and the external magnetic field is discussed.