Direct observation of magnetic relaxation in a small permalloy disk by time-resolved scanning Kerr microscopy

被引：298

作者：

Hiebert, WK ^{[1
]}

Stankiewicz, A ^{[1
]}

Freeman, MR ^{[1
]}

机构：

[1] UNIV WARSAW,INST PHYS,PL-15424 WARSAW,POLAND

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 79卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.79.1134

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Magnetic oscillations were studied in a single, lithographically patterned disk (8 mu m diam x 0.1 mu m thick) of permalloy placed in an in-plane biasing magnetic field, excited by subnanosecond pulses of perpendicular field. Local changes of the perpendicular magnetization component were detected by time-resolved scanning magneto-optical Kerr microscopy, allowing direct observation of the nonuniform spatial evolution of the magnetization. It was found that the modal frequency of the oscillations is very close to the ferromagnetic resonance frequency. The Landau-Lifshitz-Gilbert equation with damping constant equal to 0.008 describes broad features of the data, although departures due to the nonuniform response are also evident.

引用

页码：1134 / 1137

页数：4

共 15 条

[1] Spin reversal in bilayer ultrathin magnetic films [J].