Gd-Co Films Research Articles

Magnetic properties of amorphous Gd-Fe films prepared by evaporation

Amorphous GdxFe1−x films with 0.18<x<0.33 were prepared by electron-beam coevaporation of the elements. The composition dependence of anisotropy and the composition and temperature dependence of saturation magnetization of the films were studied. In contrast to evaporated Gd-Co films, where anisotropy is in-plane, the Gd-Fe films were found to have strong perpendicular anisotropy with the uniaxial anisotropy constant (Ku) decreasing monotonically from 3.8×105 erg/cm3 at x=0.18 to 2.0×105 erg/cm3 at x=0.33. The perpendicular anisotropy field (HK) reached a maximum at the compensation composition (x=0.26) and fell off rapidly on both sides. The findings suggest that anisotropy in evaporated films is due to a longer-range structural ordering than the pair ordering which is assumed to exist in sputtered films. Saturation magnetization measurements showed that magnetization of the amorphous alloys could be closely approximated from the moments of pure crystalline Gd and Fe. The 0 °K moment of Fe was found to be 2.20μB (0.23<x<0.31) suggesting less charge transfer than in crystalline GdFe3. Q values (HK/4πMs) of the alloys exceeded unity in the range 0.19<x<0.31.

Anomalous Magneto-optical Hysteresis Loops of Sputtered Gd-Co Films

Hysteresis loop anomaly in Gd-Co films has been studied by measuring magneto-optical Kerr loops at a temperature range from 20 to 60°C. Anomalous loops were observed at one surface of the films and in a certain temperature range. The other surface always gave normal loops. All the features of the observed anomalous loops can be explained by a magnetization gradient model along the film thickness.

Gd-Coスパッタ膜の作製と特性

Gd-Coスパッタ膜の作製と特性

Preparation and some magnetic properties of amorphous GdxFe1−x alloy thin films

Amorphous GdxFe1−x (0⩽x⩽0.35) thin films were prepared by rf cosputtering using the iron target covered partially with small gadolinium pieces. The composition dependences of the saturation magnetization, M-H loops, and domain structures were studied. The coercive force was obtained as a function of the composition and temperature. Such magnetic properties of GdFe sputtered films were very similar those of amorphous GdCo films.

The Origin of the Composition Variation of Amorphous Gd-Co Films Prepared by rf-Bias-Sputtering

The Origin of the Composition Variation of Amorphous Gd-Co Films Prepared by rf-Bias-Sputtering

Static bubble domain properties of amorphous Gd-Co films: R Hasegawa, J Appl Phys, 45, (7), 1974, 3109–3112

Static bubble domain properties of amorphous Gd-Co films: R Hasegawa, J Appl Phys, 45, (7), 1974, 3109–3112

Properties of sputtered Gd-Co films for magnetic bubbles

Stripe domains and bubble domains are observed in Gd-Co sputtered films. The domain patterns are different from one another for different preparation conditions. In this paper, preparation conditions and some properties of Gd-Co films, namely the domain pattern observed by the polar Kerr magneto-optic effect and the M-H loops measured by the Kerr and the Hall effect, are reported. The temperature dependence of the M-H loop is studied about the compensation temperature. The properties of Gd-Co sputtered films are discussed not only for bubble domain but also for thermomagnetic application.

Hall effects in Gd-Co sputtered films

Gd-Co films which have uniaxial magnetic anisotropy perpendicular to the film plane are prepared by the rf-sputtering technique. The transverse Hall effect and the planar Hall effect are studied on these films. Results obtained show that the transverse Hall effect is much larger than the planar one in these films. It is also found that the extraordinary Hall effect plays a dominant role in the transverse Hall effect. At the compensation temperature the polarity of the Hall voltage is reversed. The hysteresis loop of the Hall characteristic corresponds to the M-H loop observed by the Kerr magneto-optic effect.