In the last twenty years , extensive studies have been made on the structure , basic magnetic properties , interlayer coupling , interfacial structures and its relative effects in magnetic thin and ultrathin films due to their potential application in magnetic random access memory ( mram ) and ultrahigh - density data storage 隨著在磁性隨機存儲器和超高密度存儲技術中應用的不斷拓展,近二十年來,磁性薄膜和超薄膜的結構、基本磁性、層間耦合、界面狀況及其相關效應一直是人們研究的熟點和難點之一。