Exchange bias in nanopatterned Co antidots prepared by self-assembling polystyrene nanospheres |
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Authors: | Marco Coïsson Luca Boarino Federica Celegato Natascia De Leo Paola Tiberto Franco Vinai |
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Institution: | (1) Electromagnetism Division, INRIM, strada delle Cacce 91, 10135 Turin, TO, Italy |
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Abstract: | 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 ~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. |
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