TY - JOUR
T1 - Mössbauer spectroscopical investigation of the exchange biased Fe/MnF2 interface
AU - Sahoo, B.
AU - Macedo, W. A.A.
AU - Keune, W.
AU - Kuncser, V.
AU - Eisenmenger, J.
AU - Nogués, J.
AU - Schuller, I. K.
AU - Felner, I.
AU - Liu, Kai
AU - Röhlsberger, R.
PY - 2006/4
Y1 - 2006/4
N2 - Two different Fe/MnF2 samples have been prepared by e-beam evaporation on MgO(001) substrates. The Fe layer in the samples includes a 10 Å thick 57Fe probe layer either at the Fe/MnF2 interface (interface sample) or 35 Å away from the interface (center sample). The samples are characterized by X-ray diffraction, conversion electron Mössbauer spectroscopy (CEMS) and SQUID magnetometry. 57Fe CEMS has been employed to study the depth dependent hyperfine interactions in Fe/MnF2 as a function of temperature between 18 K to 300 K. The hyperfine field Bhf has been obtained for the interfacial and off-interfacial 57Fe layers. At the interface, besides Bhf of bcc-Fe, the presence of a component with a distribution P(Bhf) is observed. The latter is assigned to interfacial 57Fe atoms, indicating some (∼15%, equivalent to ∼1 Fe atomic layer) intermixing at the Fe/MnF2 interface and a decrease of the average hf > by 21%. The influence of the interface disappears as the 57Fe probe layer is placed away from the interface. The temperature dependence of the average hf > of the interface has been measured. The Fe spins, at remanence, are found to lie in the film plane.
AB - Two different Fe/MnF2 samples have been prepared by e-beam evaporation on MgO(001) substrates. The Fe layer in the samples includes a 10 Å thick 57Fe probe layer either at the Fe/MnF2 interface (interface sample) or 35 Å away from the interface (center sample). The samples are characterized by X-ray diffraction, conversion electron Mössbauer spectroscopy (CEMS) and SQUID magnetometry. 57Fe CEMS has been employed to study the depth dependent hyperfine interactions in Fe/MnF2 as a function of temperature between 18 K to 300 K. The hyperfine field Bhf has been obtained for the interfacial and off-interfacial 57Fe layers. At the interface, besides Bhf of bcc-Fe, the presence of a component with a distribution P(Bhf) is observed. The latter is assigned to interfacial 57Fe atoms, indicating some (∼15%, equivalent to ∼1 Fe atomic layer) intermixing at the Fe/MnF2 interface and a decrease of the average hf > by 21%. The influence of the interface disappears as the 57Fe probe layer is placed away from the interface. The temperature dependence of the average hf > of the interface has been measured. The Fe spins, at remanence, are found to lie in the film plane.
KW - Conversion electron Mössbauer spectroscopy
KW - Exchange bias
KW - Fe/MnF
KW - Interfacial properties
KW - Spin structure
UR - http://www.scopus.com/inward/record.url?scp=33846448152&partnerID=8YFLogxK
U2 - 10.1007/s10751-006-9453-8
DO - 10.1007/s10751-006-9453-8
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AN - SCOPUS:33846448152
SN - 0304-3843
VL - 169
SP - 1371
EP - 1377
JO - Hyperfine Interactions
JF - Hyperfine Interactions
IS - 1-3
ER -