Mn3O4/Fe3O4超晶格異向性與介面耦合的探討

• Main Authors: Yen-Chao Wang, 王彥超
• Other Authors: 陳恭
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/35204231779597159373

碩士 === 國立中正大學 === 物理系 === 90 === We found that ferrimagnetic/ferromagnetic Mn3O4 / Fe3O4 superlattices were grown on MgO（100）and MgO（110）with antiferromagnetically or ferromagnetically coupled at the interface . In the thesis，we change Mn3O4 from 10 Å to 160 Å , which has much layer thickness so that the interface effect can be compared with previous results . We used a SQUID to measure a series of M-H and M-T curves and from those data to find . When Mn3O4 from 10 Å to 160 Å . The interface were be change from parallel to antiparallel coupling . We also find with grown on MgO（110）, the compensation point were changed by the direction of the external field . This behavior of Mn3O4 / Fe3O4 is probably related to an anisotropy effect of Mn3O4 . Mn3O4 moment persists to the external field direction even when the magnitude is relatively smaller . Since the Curie temperature of Mn3O4 and Fe3O4 is 43K and 858K respectively . The anisotropy were existed at T＜55K and it quickly increase with decreasing temperature .