Multiple switching fields and domain wall pinning in single Co nanowires

被引:12
作者
Brands, M [1 ]
Dumpich, G [1 ]
机构
[1] Univ Duisburg Gesamthsch, Fachbereich Phys, AG Farle, D-47048 Duisburg, Germany
关键词
D O I
10.1088/0022-3727/38/6/005
中图分类号
O59 [应用物理学];
学科分类号
摘要
We have measured the low temperature magnetoresistance (MR) of ferromagnetic cobalt nanowires of 30 nm thickness and widths between 32 and 700 nm. The wires are in situ capped with a 2 nm Pt layer to prevent oxidation. Single wires exhibit sharp resistance peaks at the coercive fields H-c-where H-c increases with decreasing wire width-which can be completely understood in terms of an in-plane switching process. Adding 2 x 2 mu m(2) nucleation pads at the wire ends clearly reduces the coercive fields of the wires. By fabricating wires with two different widths a two-step switching process can be achieved where the wider nanowire switches first. In this case, a single domain wall is introduced in the constriction between the wider and the narrower part of the wire. The MR can be studied in more detail and with higher accuracy by adding additional voltage leads close to the domain wall. The results are discussed to distinguish between contributions resulting from domain wall magnetoresi stance and anisotropic magnetoresistance (AMR).
引用
收藏
页码:822 / 826
页数:5
相关论文
共 18 条
[1]   THE MAGNETORESISTANCE OF SUBMICRON FE WIRES [J].
BLUNDELL, SJ ;
SHEARWOOD, C ;
GESTER, M ;
BAIRD, MJ ;
BLAND, JAC ;
AHMED, H .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1994, 135 (01) :L17-L22
[2]   Absence of weak electron localization in ferromagnetic cobalt wires [J].
Brands, M ;
Carl, A ;
Dumpich, G .
EUROPHYSICS LETTERS, 2004, 68 (02) :268-274
[3]   Domain wall injection and propagation in planar Permalloy nanowires [J].
Cowburn, RP ;
Allwood, DA ;
Xiong, G ;
Cooke, MD .
JOURNAL OF APPLIED PHYSICS, 2002, 91 (10) :6949-6951
[4]  
Cullity B. D., 1972, INTRO MAGNETIC MAT
[5]   Magnetoresistance of single Co nanowires [J].
Dumpich, G ;
Krome, TP ;
Hausmanns, B .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2002, 248 (02) :241-247
[6]   Magnetoresistance and magnetization reversal process of Co nanowires covered with Pt [J].
Hausmanns, B ;
Krome, TP ;
Dumpich, G .
JOURNAL OF APPLIED PHYSICS, 2003, 93 (10) :8095-8097
[7]  
HAUSMANNS B, 2003, THESIS U DUISBURG ES
[8]   Dynamics of a magnetic domain wall in magnetic wires with an artificial neck [J].
Himeno, A ;
Ono, T ;
Nasu, S ;
Shigeto, K ;
Mibu, K ;
Shinjo, T .
JOURNAL OF APPLIED PHYSICS, 2003, 93 (10) :8430-8432
[9]   New effects in ferromagnetic nanostructures [J].
Hong, KM ;
Giordano, N .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1995, 151 (03) :396-402
[10]  
Hubert A., 1998, MAGNETIC DOMAINS ANA