Quantum depinning of the magnetic vortex core in micron-size permalloy disks

被引：13

作者：

Zarzuela, Ricardo ^{[1
]}

Velez, Sauel ^{[1
]}

Manel Hernandez, Joan ^{[1
]}

Tejada, Javier ^{[1
]}

Novosad, Valentyn ^{[2
]}

机构：

[1] Univ Barcelona, Dept Fis Fonamental, Grp Magnetisme, E-08028 Barcelona, Spain

[2] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

来源：

PHYSICAL REVIEW B | 2012年 / 85卷 / 18期

关键词：

RELAXATION; DYNAMICS; SUPERCONDUCTOR; VORTICES; STATE;

D O I：

10.1103/PhysRevB.85.180401

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The vortex state, characterized by an in-plane closed flux domain structure and an out-of-plane magnetization at its center (the vortex core), is one of the magnetic equilibria of thin soft ferromagnetic micron-size dots. In the past two decades many groups have been working on the dynamics of the magnetic moment in nanomagnetic materials at low temperatures, giving rise to the observation of quantum relaxations and quantum hysteresis cycles. We report experimental evidence of quantum dynamics of the vortex core of micron-size permalloy (Fe19Ni81) disks induced by the application of an in-plane magnetic field. It is attributed to the quantum tunneling of the vortex core through pinning barriers, which are associated with structural defects in the dots, toward its equilibrium position.

引用

页数：5

共 29 条

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