Exchange bias in nanopatterned Co antidots prepared by self-assembling polystyrene nanospheres

被引:3
作者
Coisson, Marco [1 ]
Boarino, Luca [1 ]
Celegato, Federica [1 ]
De Leo, Natascia [1 ]
Tiberto, Paola [1 ]
Vinai, Franco [1 ]
机构
[1] INRIM, Electromagnetism Div, I-10135 Turin, TO, Italy
关键词
Nanopatterned films; Thin magnetic films; Exchange bias; Magneto-resistance; GIANT MAGNETORESISTANCE; MAGNETIC-PROPERTIES; ANISOTROPY; TRANSPORT; ARRAYS;
D O I
10.1007/s11051-011-0309-z
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The exchange bias properties of nanopatterned thin films of Co, on top of which a native Co-oxide layer develops spontaneously, are studied by means of magnetic and magneto-resistance measurements. Both continuous and patterned films are investigated, the latter in the form of antidot arrays prepared with the self-assembling polystyrene nanospheres technique. The obtained antidot arrays are in the hexagonal close-packed configuration and cover a surface area of several square millimetres. Nanopatterned samples turn out to have a very good repeatability of their magnetic and magneto-resistive properties. The presence of a native oxide is responsible for the development of an exchange bias effect at temperatures below similar to 150 K, which has been reported both on hysteresis loops and on magneto-resistance curves; these consist of a superposition of an anisotropic magneto resistance (AMR) effect and a giant magneto-resistance (GMR)-like effect. The determination of the bias field by means of the two different sets of data is consistent and gives a complete picture of the phenomenology in this kind of nanopatterned magnetic systems.
引用
收藏
页码:5641 / 5651
页数:11
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