(ti) / Fe / Ti Nano-thin Films, Micro-structure And Magnetic Properties,

The research of magnetic films is the focus in magnetism field. The achievement was not only applied to the fields of magnetic recording and sensors etc, but also perfected the theory of micro-magnetism.Some series films were prepared by RF and DC magnetron sputtering onto glass substrates. Microstructures of films were examined by X-ray diffraction (XRD). Morphologies and domain structures were observed by scanning probe microscope (SPM). And magnetic properties were measured by vibrating sample magnetometer (VSM). The microstructure and magnetic properties were analyzed as functions of the thickness of Ti layers (x), annealing temperature(Ta )and substrate temperatur(e Ts) in detail. Thicknesses of Ti layer, annealing temperature and substrate temperature have great effects on the microstructure and magnetic properties of pseudo-sandwich Ti/Fe/Ti films. XRD show that the Ti/Fe/Ti magnetic films are formed as the Body-Centered Cube (BCC) texture; VSM measurements indicate that all samples show a strong perpendicular anisotropy, and the out-of-plane coercivity reaches the maximum 3.4kOe, for Ti (56 nm)/Fe(45 nm)/Ti(56 nm) at Ta=500℃; SPM measurements show that the shape-anisotropy of Fe is more visible. The high coercivity of the samples is attributed to shape- anisotropy of the films.Otherwise, For series of Fe(18 nm)/Ti(x nm)( x:1 nm～10 nm), The thickness of Ti layer and annealing temperature have great effects on the microstructure and magnetic properties of films. VSM measurements indicate that varieties of the out-of-plan coercivity (Hc⊥) with the Ti layer thickness is periodicity, and the coercivity value (Hc⊥) reach the maximum 1.6 kOe at x=7 nm and Ta =500?C. AFM images show that the minimum average magnetic domain size is about 18 nm, and the value of the surface roughness (Ra) is lower than 2.73 nm.δM curves show that the exchange-interaction between magnetic grains decreases significantly with the addition of thin Ti layer and annealing temperature.