2002
DOI: 10.1063/1.1459108
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Balistic magnetoresistance in nanocontacts electrochemically grown between macro- and microscopic ferromagnetic electrodes

Abstract: Our results prove the local origin of magnetoresistance in electrochemically deposited Ni nanocontacts. Experiments have been done using a complex setup for both in situ growth and ballistic magnetoresistance ͑BMR͒ measurements. Nanocontacts have been grown between two macroscopic Ni wires. In situ experiments with variation of the nanocontact diameter from 3 to 20 nm have been done using the same pair of wires. BMR values from 0.5% to 100% have been observed but no correlation of BMR value with the sample res… Show more

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Cited by 24 publications
(12 citation statements)
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“…For instance, the BMR loops measured within half an hour of the first measurement nearly recovered the initial contact resistance ͑to Ϸ10 ⍀͒ and high BMR value approaching over 2600%, while the high-field saturation resistance remained essentially unchanged ͑270 ⍀͒. As in previously reported studies, 6,8,9 it is difficult to directly obtain a series of samples that have exactly the same nanocontact geometry and domain-wall configuration within the confines of the nanocontact. This makes a meaningful relationship between contact resistance and BMR difficult.…”
mentioning
confidence: 71%
“…For instance, the BMR loops measured within half an hour of the first measurement nearly recovered the initial contact resistance ͑to Ϸ10 ⍀͒ and high BMR value approaching over 2600%, while the high-field saturation resistance remained essentially unchanged ͑270 ⍀͒. As in previously reported studies, 6,8,9 it is difficult to directly obtain a series of samples that have exactly the same nanocontact geometry and domain-wall configuration within the confines of the nanocontact. This makes a meaningful relationship between contact resistance and BMR difficult.…”
mentioning
confidence: 71%
“…Also, at this point, we should report that we have measured hundreds of samples [4,8,11] on contacts deposited in evaporated thin films (say up to 100 nm thickness) and never see BMR effects except in one case. In addition to contacts (with resistances smaller than 500 O), there are unexpected large BMR values with pure metals [3,7].…”
Section: Article In Pressmentioning
confidence: 92%
“…This interest is stimulated by at least two reasons. On one hand, a giant magnetoresistance, up to several hundred percent at room temperature, has been observed for ferromagnetic metal point contacts [1]. This has opened potential for their application in highly compacted magnetic-field sensors and read heads.…”
Section: Introductionmentioning
confidence: 99%