AI Article Synopsis
- - We studied how temperature affects a second order magnetic phase transition in tiny Cr2O3 clusters embedded in an insulating MgO layer, using tunnel magneto-resistance to examine them.
- - The Cr2O3 clusters transition from an anti-ferromagnetic state, which has no net magnetic moment at near absolute zero, to a weak ferromagnetic state that reaches saturation around 10 K.
- - Additionally, we found that the temperature at which this magnetic phase transition occurs can be influenced by applying an electric field, showing a linear relationship between the two.
Article Abstract
We observe, as a function of temperature, a second order magnetic phase transition in nanometric Cr2O3 clusters that are epitaxially embedded in an insulating MgO matrix. They are investigated through their tunnel magneto-resistance signature, the MgO layer being used as a tunnel barrier. We infer the small magnetic dipoles carried by the Cr2O3 clusters and provide evidence of a magnetic phase transition at low temperature in those clusters: they evolve from an anti ferromagnetic state, with zero net moment close to 0 K, to a weak ferromagnetic state that saturates above about 10 K. The influence of magneto-electric effects on the weak ferromagnetic phase is also striking: the second order transition temperature turns out to be linearly dependent on the applied electric field.
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| http://dx.doi.org/10.1088/0957-4484/27/24/245706 | DOI Listing |
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