Control of magnetization dynamics in Ni81Fe19 thin films through the use of rare-earth dopants

被引：115

作者：

Bailey, W ^{[1
]}

Kabos, P ^{[1
]}

Mancoff, F ^{[1
]}

Russek, S ^{[1
]}

机构：

[1] NIST, Div 814, Boulder, CO 80305 USA

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2001年 / 37卷 / 04期

关键词：

magnetization dynamics; Ni-Fe alloys; rare-earth;

D O I：

10.1109/20.950957

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We show that the magnetization dynamics of soft ferromagnetic thin films can be tuned using rare-earth (RE) dopants. Low concentrations (2 to 10%) of Tb in 50 mn Ni-81 Fe-19 films are found to increase the Gilbert magnetic damping parameter a over two orders of magnitude without great effect on easy axis coercivity or saturation magnetization. Comparison with Gd dopants indicates that the orbital character of the Th moment is important for transferring magnetic energy to the lattice. Structural trans formations from the crystalline to the amorphous state, observed over the first 2%-10% of RE doping, may play a contributing but not sufficient role in damping in these films. The approach demonstrated here shows promise for adjusting the dynamical response, from underdamped to critically damped, in thin film materials for magnetic devices.

引用

页码：1749 / 1754

页数：6

共 10 条

[1] Minimum field strength in precessional magnetization reversal [J].