Aufsatz in einer Fachzeitschrift
Exchange anisotropy modification in NiO/NiFe bilayers by ion bombardment
Details zur Publikation
Autor(inn)en: | Engel, D.; Kronenberger, A.; Jung, M.; Schmoranzer, H.; Ehresmann, A.; Paetzold, A.; Röll, K. |
Publikationsjahr: | 2003 |
Zeitschrift: | Journal of Magnetism and Magnetic Materials |
Seitenbereich: | 275-281 |
Jahrgang/Band : | 263 |
ISSN: | 0304-8853 |
Zusammenfassung, Abstract
The dose dependence of the exchange bias field modification by He-ion bombardment in an applied magnetic field was investigated for an oxidic antiferromagnet/ferromagnet bilayer system consisting of NiO/NiFe in continuation of previous investigations for metallic antiferromagnet/ferromagnet systems (FeMn/NiFe, PtMn/NiFe, CrMn/NiFe). For low ion doses (<1.5 x 1015 ions/cm2), in a magnetic field applied parallel to the as-grown exchange bias field direction, the exchange bias field Heb is enhanced compared to the as-grown field Heb,0, i.e. Heb/Heb,0>1. For higher doses, the relative exchange bias field Heb/Heb,0 is found to decrease gradually with increasing dose to roughly zero. Bombardment with low doses in a magnetic field applied antiparallel to the direction of Heb,0 results in magnitudes of |Heb/Heb,0|>1 and reverses the sign of Heb. For higher ion doses Heb again approaches zero. These findings are similar to the findings for the bilayer system FeMn/NiFe, but differ to those for the systems PtMn/NiFe and CrMn/NiFe. The experimental results are compared with a simulation using the SRIM code.
The dose dependence of the exchange bias field modification by He-ion bombardment in an applied magnetic field was investigated for an oxidic antiferromagnet/ferromagnet bilayer system consisting of NiO/NiFe in continuation of previous investigations for metallic antiferromagnet/ferromagnet systems (FeMn/NiFe, PtMn/NiFe, CrMn/NiFe). For low ion doses (<1.5 x 1015 ions/cm2), in a magnetic field applied parallel to the as-grown exchange bias field direction, the exchange bias field Heb is enhanced compared to the as-grown field Heb,0, i.e. Heb/Heb,0>1. For higher doses, the relative exchange bias field Heb/Heb,0 is found to decrease gradually with increasing dose to roughly zero. Bombardment with low doses in a magnetic field applied antiparallel to the direction of Heb,0 results in magnitudes of |Heb/Heb,0|>1 and reverses the sign of Heb. For higher ion doses Heb again approaches zero. These findings are similar to the findings for the bilayer system FeMn/NiFe, but differ to those for the systems PtMn/NiFe and CrMn/NiFe. The experimental results are compared with a simulation using the SRIM code.
