TY - JOUR
T1 - Influence of ferromagnetic thickness on structural and magnetic properties of exchange-biased manganite superlattices
AU - Campillo, G.
AU - Gomez, M. E.
AU - Berger, A.
AU - Hoffmann, A.
AU - Escudero, R.
AU - Prieto, P.
N1 - Funding Information:
This work was supported by COLCIENCIAS Project No. 1106-05-11458 CT-046-2002, the Excellence Center for Novel Materials, under Colciencias Contract No. 043-2005, and U.S. DOE-BES under Contract No. W-31-109-ENG-38.
PY - 2006
Y1 - 2006
N2 - The structural and magnetic properties of superlattice structures of alternating ferromagnetic La23 Ca13 MnO3 (F-LCMO) and antiferromagnetic La13 Ca23 MnO3 (AF-LCMO) layers were systematically studied as functions of F-LCMO layer thickness, tF. Samples were grown via a high-oxygen pressure sputtering process. Magnetic hysteresis measurements after field cooling revealed an exchange bias, Hex, at low temperatures in such superlattices. We found a correlation of the structural and magnetic properties with tF. In particular, we observed diminished resistance, increased metal-insulator transition temperature, TMI, as well as increased Curie temperature with increasing tF. Additionally, we found that the temperature dependence of Hex* tF for superlattices with the same antiferromagnetic layer thickness, tAF, is a unique function and independent of tF. We also find that the low-temperature saturation magnetization, MS, follows a power-law dependence with temperature, according to M0 (1-B Tα) with an exponent of α=2.5±0.2.
AB - The structural and magnetic properties of superlattice structures of alternating ferromagnetic La23 Ca13 MnO3 (F-LCMO) and antiferromagnetic La13 Ca23 MnO3 (AF-LCMO) layers were systematically studied as functions of F-LCMO layer thickness, tF. Samples were grown via a high-oxygen pressure sputtering process. Magnetic hysteresis measurements after field cooling revealed an exchange bias, Hex, at low temperatures in such superlattices. We found a correlation of the structural and magnetic properties with tF. In particular, we observed diminished resistance, increased metal-insulator transition temperature, TMI, as well as increased Curie temperature with increasing tF. Additionally, we found that the temperature dependence of Hex* tF for superlattices with the same antiferromagnetic layer thickness, tAF, is a unique function and independent of tF. We also find that the low-temperature saturation magnetization, MS, follows a power-law dependence with temperature, according to M0 (1-B Tα) with an exponent of α=2.5±0.2.
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U2 - 10.1063/1.2167047
DO - 10.1063/1.2167047
M3 - Article
AN - SCOPUS:33646744143
SN - 0021-8979
VL - 99
JO - Journal of Applied Physics
JF - Journal of Applied Physics
IS - 8
M1 - 08C106
ER -