Colossal magnetoresistance materials-based junctions with antiferromagnetic insulating barriers
| Autor: | L. M. B. Alldredge, Yuri Suzuki |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Colossal magnetoresistance
Materials science Physics and Astronomy (miscellaneous) Condensed matter physics Insulator (electricity) Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Epitaxy Inductive coupling Barrier layer Condensed Matter::Materials Science Condensed Matter::Superconductivity Electrode Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Néel temperature |
| Zdroj: | Applied Physics Letters. 85:437-439 |
| ISSN: | 1077-3118 0003-6951 |
| Popis: | We have fabricated epitaxial La0.7Sr0.3MnO3∕La0.35Ca0.65MnO3∕La0.7Sr0.3MnO3 trilayer magnetic tunnel junctions in order to produce high-quality interfaces through the use of an isostructural barrier layer. The barrier we have chosen (La0.35Ca0.65MnO3) is an antiferromagnetic insulator with a Neel temperature of ∼160K. We observed junction magnetoresistances (JMRs) of up to 4% at 5K. The large energy cost to flip a spin in an antiferromagnet preserves some degree of spin orientation during transport through the junctions. However, magnetic coupling between the electrode and the barrier inevitably suppresses the JMR. Despite the magnetic coupling, an antiferromagnetic barrier does not suppress the JMR completely. |
| Databáze: | OpenAIRE |
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