Abstract
Inducing oxygen into Co-Fe-Ta-B amorphous alloy system makes the transparent amorphous magnetic thin film (Co20Fe47Ta20B13)1-xOx. Oxygen content plays a major role in the magnetization properties of the films. Samples with x=0.41 have a large coercivity ∼1000 Oe, which is 20 times larger than the low oxygen content samples. The forming of a set of single domain magnetic granules rather than continuous magnetic film makes the different magnetization mechanisms. The deviation from Bloch law of saturation magnetization with temperature indicates the Bose-Einstein condensation occurring in magnetic nanostructures. According to the superparamagnetic theory, magnetic phase diagram of the system has been obtained. Monte-Carlo method is used for the simulation of the magnetization of a single domain magnetic granular system at a finite temperature. The simulation results match the experiment to some extent in magnetization-filed curve and field-cooling and zero-field-cooling magnetization curve. This work provides a systematical study of transparent amorphous magnetic thin film system and helps us to know better of this material.
Highlights
Metallic glass, including amorphous rare-earth and transitionmetal alloys, have excellent mechanical properties such as high Young’s modulus and fracture strength.1–3 Among them, there is a kind of magnetic material with good soft magnetic properties which has applications in surface coating, sensor and transformer core.4–6 Co-Fe-Ta-B system is a representative of this material
The deviation from Bloch law of saturation magnetization with temperature indicates the Bose-Einstein condensation occurring in magnetic nanostructures
Percolation patterns have been observed in the sample with x=0.41. This provides an evidence for taking the thin film as a magnetic granular system
Summary
Metallic glass, including amorphous rare-earth and transitionmetal alloys, have excellent mechanical properties such as high Young’s modulus and fracture strength.1–3 Among them, there is a kind of magnetic material with good soft magnetic properties which has applications in surface coating, sensor and transformer core.4–6 Co-Fe-Ta-B system is a representative of this material. Monte-Carlo method is used for the simulation of the magnetization of a single domain magnetic granular system at a finite temperature. This work provides a systematical study of transparent amorphous magnetic thin film system and helps us to know better of this material.
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