Enhanced giant magnetoimpedance effect and field sensitivity in Co-coated soft ferromagnetic amorphous ribbons

被引：49

作者：

Laurita, Nicholas ^{[1
]}

Chaturvedi, Anurag ^{[1
]}

Bauer, Christopher ^{[1
]}

Jayathilaka, Priyanga ^{[1
]}

Leary, Alex ^{[2
]}

Miller, Casey ^{[1
]}

Phan, Manh-Huong ^{[1
]}

McHenry, Michael E. ^{[2
]}

Srikanth, Hariharan ^{[1
]}

机构：

[1] Univ S Florida, Dept Phys, Tampa, FL 33620 USA

[2] Carnegie Mellon Univ, Dept Mat Sci & Engn, Pittsburgh, PA 15213 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2011年 / 109卷 / 07期

基金：

美国国家科学基金会;

关键词：

MAGNETO-IMPEDANCE;

D O I：

10.1063/1.3548857

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A 50 nm-thick Co film has been grown either on the free surface (surface roughness, similar to 6 nm) or on the wheel-side surface (surface roughness, similar to 147 nm) of Co84.55Fe4.45Zr7B4 amorphous ribbons. A comparative study of the giant magnetoimpedance (GMI) effect and its field sensitivity (eta) in the uncoated and Co-coated ribbons is presented. We show that the presence of the Co coating layer enhances both the GMI ratio and eta in the Co-coated ribbons. Larger values for GMI ratio and eta are achieved in the sample with Co coated on the free ribbon surface. The enhancement of the GMI effect in the Co-coated ribbons originates mainly from the reduction in stray fields due to surface irregularities and the enhanced magnetic flux paths closure. These findings provide good guidance for tailoring GMI in surface-modified soft ferromagnetic ribbons for use in highly sensitive magnetic sensors. (C) 2011 American Institute of Physics. [doi:10.1063/1.3548857]

引用

页数：3

共 15 条

[1] Giant magnetoimpedance in trilayer structures of patterned magnetic amorphous ribbons [J].