Study On Magnetoelectric Transport Characteristics Of Metallic Glassy Magnetic Materials

In recent years,amorphous alloy materials have greatly attracted people's attention because of their excellent properties and corresponding practical application values.Because of the excellent soft ferromagnetic properties,the iron-based metallic glasses have become the most popular research topics in the field of functional materials,which showing a great prospect in the field of industrial and engineering materials manufacturing.Previous studies based on iron-based metallic glass just focused only on the properties of magnetic?mechanical?corrosion resistance and grass-forming ability,there is a lack of research on other characteristics.Recently,it has been found that iron-based metallic glasses not only have excellent soft ferromagnetic properties,but also show us great semiconductor-like conductive properties,and we can even regulate its conductive properties by changing the preparation conditions.1?We have investigated the magnetic and electrical properties of a ribbon-shaped iron-based amorphous alloy Fe_85-xCo_xTi₇Hf₆B₂(x=20,30,35 at%)which were fabricated by a single copper roller vacuum melt-spinning technique.We have observed that the coercivity of these samples is increased slightly with the increase of Co content,but always smaller than 5 Oe,maintaining a good soft ferromagnetic property.Interestingly,the increase of Co content leads to a significant change of the electrical properties in our iron-based amorphous alloy system.For example,a negative temperature coefficient of resistance was measured when the Co content is 20%,corresponding to a semiconductor behavior.But when the Co content is 30%and 35%,the temperature coefficient of resistance was a positive value,showing a similar resistance temperature characteristic of metallic conductor.In addition,according to the electronegativity and ionization potential of the constituent elements in the FeCoTiHfB amorphous alloy,the physical mechanism of Co content regulating carrier concentration is revealed,which provide a new method to design new iron-based amorphous alloy materials.2?We have studied the stability of amorphous magnetic semiconductor CoFeTaBO,and the influence of oxygen content on the magnetic properties and electrical properties of the amorphous magnetic semiconductor CoFeTaBO was investigated.The stability of amorphous magnetic semiconductor CoFeTaBO film was studied by changing the external oxygen environment,and we have observed the critical depth of the influence of oxygen environment on the film.Besides,With the model of granular film we successfully explained the effects of oxygen content on magnetic properties and electrical properties of amorphous magnetic semiconductor CoFeTaBO.Provides an experimental basis for the development of such materials.