Study of ferromagnetic transition in Pd nanometer-scale constrictions using a mechanically controllable break junction technique

We measured the magnetoresistance (MR) of Pd nanometer-scale constrictions while changing the constriction size by stretching the Pd wire using a mechanically controllable break junction technique. In large constrictions, the resistance is constant for |H| less than or equal to 400 Oe, reflecting bu...

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Bibliographic Details
Published in:Applied physics letters 2012-09, Vol.101 (12), p.123114
Main Authors: Ienaga, K., Nakashima, N., Inagaki, Y., Tsujii, H., Kimura, T., Kawae, T.
Format: Article
Language:English
Subjects:
Breaking
Constrictions
Ferromagnetism
Magnetic properties
Magnetoresistivity
Palladium
Stability
Wire
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Summary:We measured the magnetoresistance (MR) of Pd nanometer-scale constrictions while changing the constriction size by stretching the Pd wire using a mechanically controllable break junction technique. In large constrictions, the resistance is constant for |H| less than or equal to 400 Oe, reflecting bulk Pd paramagnetic properties. As size decreases to similar to 10 nm, the MR effect with hysteresis is observed with a sweeping field, indicating the ferromagnetic transition in Pd constrictions. We proposed this technique to detect ferromagnetic transitions caused by downsizing in paramagnetic metals and to study magnetic properties after the transitions.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4754565