The interaction of Fe on MgO(100) surfaces

Fetzer, Cs.; Dézsi, I.; Szücs, I. S.; Tanczikó, F.; Balogh, Adam G.

doi:10.1016/j.susc.2009.04.022

Cited by 5 publications

(2 citation statements)

References 28 publications

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“…However, since natural Fe contains approximately 2% of 57 Fe, it is clear that about 40% of our Mössbauer signal originates from the Fe/Tb multilayer ͑and about 60% from the 57 Fe probe layer͒. Recently, a large ͗B hf ͘ value of 33.8 T was also observed for a bcc 57 Fe probe layer on a bulk MgO͑001͒ substrate at 80 K. 28 We infer from the large bulklike ͗B hf ͘ value that a large Fe atomic moment ͑similar to the value of 2.2 B of bulk bcc Fe͒ is retained at the Fe/MgO͑001͒ interface, i.e., at the "bottom" interface formed by deposition of Fe onto MgO͑001͒, which ͑according to the RHEED patterns, Fig. 4͑a͒ and 4͑b͒, respectively.…”

Section: Resultsmentioning

confidence: 79%

Epitaxial growth and interfacial magnetism of spin aligner for remanent spin injection: [Fe/Tb]n/Fe/MgO/GaAs-light emitting diode as a prototype system

Schuster

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Stromberg

et al. 2010

Journal of Applied Physics

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Spin injection light-emitting diode with vertically magnetized ferromagnetic metal contactsWe have successfully grown and characterized ͓Fe/ Tb͔ 10 / Fe͑001͒ / 57 Fe͑001͒ / MgO͑001͒ multilayer contacts on a GaAs-based light emitting diode. Using 57 Fe conversion-electron Mössbauer spectroscopy at room temperature ͑RT͒ and at 4.2 K, we provide atomistic proof of large perpendicular Fe spin components in zero external field at and below RT at the 57 Fe͑001͒ / MgO͑001͒ interface. Further, indirect evidence of large interfacial Fe atomic moments is provided. Our contacts serve as a prototype spin aligner for remanent electrical spin injection at RT.

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Section: Resultsmentioning

confidence: 79%

Epitaxial growth and interfacial magnetism of spin aligner for remanent spin injection: [Fe/Tb]n/Fe/MgO/GaAs-light emitting diode as a prototype system

Schuster

Brand

Stromberg

et al. 2010

Journal of Applied Physics

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“…In the literature, however, there are relatively few studies of the Fe-MgO interface. 8,12,40,41 To study a few monolayers of Fe, conversion electron Mössbauer spectroscopy (CEMS) is the most effective method, since 90% of the utilized nuclear deexcitations takes place not by γ radiation, but through the emission of conversion electrons. In spite of this, the first studies 12,40 were made on evaporated MgO and Fe layers over different substrate materials to facilitate absorption measurements, which are more easy to carry out at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of the Fe-MgO interface studied by Mössbauer spectroscopy

et al. 2013

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Thin 57 Fe layers evaporated onto an MgO(100) single-crystal substrate and covered by an evaporated MgO layer were studied by low-temperature conversion electron Mössbauer spectroscopy. The temperature dependence of the spectra indicates superparamagnetic behavior below 8 ML nominal thickness of the Fe layer signaling a cluster-type growth mode. The low-temperature hyperfine fields are consistent with a model that defines two types of metallic Fe atoms: bulklike and interfacial ones. Formation of FeO or (Fe,Mg)O at the interface layer is not observed. The sample with a 4-ML Fe layer when grown over a cleaved MgO substrate shows almost perfect perpendicular magnetization, as locally probed at 15 K by the hyperfine magnetic field, while random magnetization orientation and lower blocking temperature is observed in the case of a polished substrate. The perpendicular anisotropy observed at low temperature is attributed to mechanical stresses arising from the epitaxial relation and the different temperature dilatation of the subsequent layers.

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