The magnetic properties of the substituted spinel Mg1-xMnxMn2O4, with 0 <= x <= 1, were investigated by means of superconducting quantum interference device (SQUID) magnetometry and mu SR spectroscopy. A zero-field muon spin precession is detected in the two end members and the appearance of static internal fields is evidenced in all samples below a weakly x-dependent ordering temperature T-N, different from that detected by macroscopic magnetization, T-M. For x close to 1 a noncollinear spin structure as in Mn3O4 is compatible with our low temperature results. At the opposite end (x close to zero) SQUID and mu SR data suggest an antiferromagnetic arrangement of the Mn ions on the B spinel site. A nontrivial finding is that the uniform (q=0) component of the magnetic moment scales linearly with x. This evidence is discussed on the basis of the known magnetic structure of Mn3O4
Magnetism of Mg1-xMnxO4 spinels by SQUID magnetometry and muon spin rotation spectroscopy / Paolo Ghigna, R. De Renzi, Maria C. Mozzati, Alessandro Lascialfari, G. Allodi, Marco Bimbi, Claudio Mazzoli, Lorenzo Malavasi, Carlo B. Azzoni. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 73:18(2006), pp. 184402.184402-1-184402.184402-7.
Magnetism of Mg1-xMnxO4 spinels by SQUID magnetometry and muon spin rotation spectroscopy
Alessandro Lascialfari;
2006
Abstract
The magnetic properties of the substituted spinel Mg1-xMnxMn2O4, with 0 <= x <= 1, were investigated by means of superconducting quantum interference device (SQUID) magnetometry and mu SR spectroscopy. A zero-field muon spin precession is detected in the two end members and the appearance of static internal fields is evidenced in all samples below a weakly x-dependent ordering temperature T-N, different from that detected by macroscopic magnetization, T-M. For x close to 1 a noncollinear spin structure as in Mn3O4 is compatible with our low temperature results. At the opposite end (x close to zero) SQUID and mu SR data suggest an antiferromagnetic arrangement of the Mn ions on the B spinel site. A nontrivial finding is that the uniform (q=0) component of the magnetic moment scales linearly with x. This evidence is discussed on the basis of the known magnetic structure of Mn3O4
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