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Magnetic properties of Mn3O4 film under compressive stress grown on MgAl2O4 (001) by molecular beam epitaxy
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Schematic representation of the epitaxial relationship between the cubic MAO substrate (the bottom one) and the tetragonal MnO film (the top one with 2 × 2 conventional unit cell). (b) Spin structure of the Mn tetrahedron of B sites in MnO shows two different exchange interactions: two AF bonds along the [100] or [010] chain (blue) and four bonds [two AF bonds (gray) and two F bonds (pink)] between the two chains. (c), (d) Schematic pictures of the tetragonal MnO film and the MAO substrate viewing along the [001] and [00-1] directions, respectively, indicating the same symmetrical characteristic of the two materials.

Image of FIG. 2.
FIG. 2.

RHEED patterns of the MAO (001) substrate [(a), (b)] and the MnO film [(c), (d)]. The electron beam is incident along the [110] azimuth of the MAO substrate for (a) and (c), while along the [100] for (b) and (d). The [110] and [100] axes of the MnO film are separately parallel to the [100] and [110] axes of the MAO substrate.

Image of FIG. 3.
FIG. 3.

(a) X-ray diffraction curve of the MnO film grown on the MAO (001) substrate. (b) Raman spectra measured at room temperature of the sample and the MAO (001) substrate, the modes of the substrate are indicated by black lines.

Image of FIG. 4.
FIG. 4.

Magnetic-field dependence of the magnetizations along the [100], [110], and [001] directions at 5 K. Inset shows whole curves with the field from −5 T to 5 T.

Image of FIG. 5.
FIG. 5.

(a) Temperature dependence of the magnetization in a magnetic field of 50 Oe along the [110] direction measured in the ZFC test mode (black squares) and FCW (field-cooled-warming) test mode (red circles). (b)Absolute value of the derivative curves |dM/dT| plotted with a logarithmic vertical scale and restricted to the transition regime (20 K-60 K).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetic properties of Mn3O4 film under compressive stress grown on MgAl2O4 (001) by molecular beam epitaxy