Hildebrandt, Erwin ; Yazdi, Mehrdad Baghaie ; Kurian, Jose ; Sharath, S. U. ; Wilhelm, Fabrice ; Rogalev, Andrei ; Alff, Lambert (2014)
Intrinsic versus extrinsic ferromagnetism in HfO2−x and Ni:HfO2−x thin films.
In: Physical Review B, 90 (13)
doi: 10.1103/PhysRevB.90.134426
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
We have investigated the possible evolution of an intrinsic stable ferromagnetic moment in oxygen deficient undoped and magnetically doped HfO2−x thin films grown by reactive molecular beam epitaxy. Neither oxygen vacancies nor substituted Ni in combination with such vacancies results in an observable magnetic moment for a broad range of oxygen vacancy concentrations. By combining integral and element specific magnetization measurements, we show that a fluctuating deposition rate of the magnetic dopant induces extrinsic ferromagnetism by promoting the formation of metallic clusters. We suggest the element specific measurement of an induced magnetic moment at the nonmagnetic site as a proof of intrinsic ferromagnetism in diluted magnetic semiconductors.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2014 |
| Autor(en): | Hildebrandt, Erwin ; Yazdi, Mehrdad Baghaie ; Kurian, Jose ; Sharath, S. U. ; Wilhelm, Fabrice ; Rogalev, Andrei ; Alff, Lambert |
| Art des Eintrags: | Bibliographie |
| Titel: | Intrinsic versus extrinsic ferromagnetism in HfO2−x and Ni:HfO2−x thin films |
| Sprache: | Englisch |
| Publikationsjahr: | 30 Oktober 2014 |
| Verlag: | APS Publications |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review B |
| Jahrgang/Volume einer Zeitschrift: | 90 |
| (Heft-)Nummer: | 13 |
| DOI: | 10.1103/PhysRevB.90.134426 |
| Kurzbeschreibung (Abstract): | We have investigated the possible evolution of an intrinsic stable ferromagnetic moment in oxygen deficient undoped and magnetically doped HfO2−x thin films grown by reactive molecular beam epitaxy. Neither oxygen vacancies nor substituted Ni in combination with such vacancies results in an observable magnetic moment for a broad range of oxygen vacancy concentrations. By combining integral and element specific magnetization measurements, we show that a fluctuating deposition rate of the magnetic dopant induces extrinsic ferromagnetism by promoting the formation of metallic clusters. We suggest the element specific measurement of an induced magnetic moment at the nonmagnetic site as a proof of intrinsic ferromagnetism in diluted magnetic semiconductors. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Dünne Schichten 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 17 Nov 2014 13:38 |
| Letzte Änderung: | 17 Nov 2014 13:38 |
| PPN: | |
| Sponsoren: | This work was supported by DFG through Grant No. AL 560/13-1, by the LOEWE-Centre AdRIA, by ENIAC within the project PANACHE and by BMBF (project No. 16ES0250). |
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