Probing one antiferromagnetic antiphase boundary and single magnetite domain using nanogap contacts.
We have probed one antiferromagnetic (AF) antiphase boundary (APB) and a single Fe(3)O(4) domain using nanogap contacts. Our experiments directly demonstrate that, in the case of probing one AF-APB, a large magnetoresistance (MR), high resistivity, and a high saturation field are observed as compared with the case of probing a single Fe(3)O(4) domain. The shape of the temperature-dependent MR curves is also found to differ between the single domain and one of the AF-APB measurements, with a characteristic strong temperature dependence for the single domain and temperature independence for the one AF-APB case. We argue that these observations are indicative of profound changes in the electronic transport across APBs. The investigated APB defects increase the activation energy and disturb the long-range charge ordering of monodomain Fe(3)O(4).
Wu
Han-Chun
HC
CRANN, School of Physics, Trinity College Dublin, Dublin 2, Ireland. wuhc@tcd.ie
Abid
Mohamed
M
Chun
Byong S
BS
Ramos
Rafael
R
Mryasov
Oleg N
ON
Shvets
Igor V
IV
D005290:Ferric Compounds / Q000737:chemistry*; D008280:Magnetics; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size
D005290:Ferric Compounds