(北京航空航天大學(xué) 材料科學(xué)與工程學(xué)院， 北京 100083)
摘 要: 采用洛侖茲電子顯微鏡研究了磁控濺射沉積制備的Cu(20nm)/Co/Cu/Co納米多層膜磁疇結(jié)構(gòu)隨鐵磁層間耦合效應(yīng)的變化。 Cu中間層厚度較薄時， 由于鐵磁層之間的耦合作用， 納米多層膜為垂直易磁化， 磁疇為磁泡結(jié)構(gòu)， 磁泡的平均直徑隨Cu中間層厚度的增加而減小， 多層膜矯頑力呈減小趨勢。 當(dāng)Cu中間層厚度大于3nm時， 鐵磁層之間的耦合作用減弱， 納米多層膜為面內(nèi)易磁化， 磁泡結(jié)構(gòu)的磁疇消失，全部為具有波紋狀的接近180°疇壁的磁疇結(jié)構(gòu)。
關(guān)鍵字: 納米多層膜；磁疇； 磁泡； 鐵磁耦合
Co/Cu/Co nano-multilayers
GONG Sheng-kai, XU Hui-bin
（Department of Materials Science and Engineering,
Beijing University of Aeronautics and Astronautics,
Beijing 100083, China）
Abstract:Series of Cu(20nm)/Co/Cu/Co nano-multilayers were deposited by magnetron sputtering method. The relationship between magnetic domain structure and ferromagnetic interlayer coupling was investigated by means of Lorentz electron microscope. When the thickness of Cu intermediate layer is thinner, magnetic bubbles domain is revealed, indicating that the easy axis is perpendicular to the surface. This result is considered to be ascribed by coupling effect of ferromagnetic layers. As the thickness of Cu intermediate layer increases, the average diameter of magnetic bubbles decreases and the coercivity also decreases. When the thickness of Cu intermediate layer is more than 3nm, the magnetic bubbles vanish and ripple magnetic domain structure with 180° domain wall can be observed, due to the weakening ferromagnetic coupling effect between Co layers.
Key words: nano-multilayer； magnetic domain； magnetic bubble； ferromagnetic coupling
