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Uncompensated antiferromagnetic moments in Mn-Ir/FM (FM = Ni-Co, Co-Fe, Fe-Ni) bilayers: Compositional dependence and its origin
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10.1063/1.3672450
/content/aip/journal/jap/110/12/10.1063/1.3672450
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/12/10.1063/1.3672450
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Spin-configuration of the anti-ferromagnetic (111)-plane of L12-Mn3Ir.

Image of FIG. 2.
FIG. 2.

Unit cell of the bilayer system constructed using (a) the (111)-plane of L12-Mn3Ir and the (111)-plane of the fcc crystal structure, and (b) the (111)-plane of L12-Mn3Ir and the (110)-plane of the bcc crystal structure.

Image of FIG. 3.
FIG. 3.

Grazing incident x-ray diffraction profiles measured for the Mn78Ir22/(Ni100-xCox, Co100-yFey and Fe100-zNiz) bilayers.

Image of FIG. 4.
FIG. 4.

XAS profiles (a) and XMCD spectra (b) near the Mn L 2,3 edge measured for the Mn78Ir22/(Ni100-xCox, Co100-yFey, and Fe100-zNiz) bilayers. The thin horizontal dotted lines present in the XMCD spectra represent the base (XMCD = 0) line measurements.

Image of FIG. 5.
FIG. 5.

Magnetic structure which reflects the direction of the magnetic moments near the interface of the L12-Mn3Ir/fcc-Co4 and L12-Mn3Ir/fcc-Fe4 bilayers. (a) and (b) are the initial magnetic structure of the Mn3Ir/fcc-Co4 interface in which moments of Mn and Co atoms are constrained to their original directions in their corresponding bulk system. (c) and (d) are the fixed structures after the relaxation of the frustrations. Similarly, (e) and (f) are the fixed structures for the Mn3Ir/fcc-Fe4 interface. Each figure illustrates the magnetic structure of the atomic layers for the FM (top) and AF (middle) layers nearest to the interface and the second nearest AF layer to the interface (bottom). The cross, triangle, and square marks in each layer indicate the in-plane positions of the atoms projected directly on the layer. The arched arrows depict the rotation direction of Mn spins by the relaxation from the initial magnetic structure (left column). The block arrows labeled as UC indicate the directions of the net moment induced in the AF layer. In the second nearest AF layer to the interface (bottom), the relaxation angle of Mn spins are too small to be illustrated.

Image of FIG. 6.
FIG. 6.

Magnetic structure which reflects the direction of the magnetic moments of the L12-Mn3Ir/fcc-Co2Fe2 interface. Pairs (a) and (b), and (c) and (d) are the same atomic configurations with opposite magnetization alignments in their FM layers. The triangle and square marks shown in the AF layers indicate the in-plane positions of the FM atoms projected directly on the Mn3Ir layer. The arched arrows depict the rotation direction of Mn spins by relaxation. The block arrows labeled as UC on the left side of the AF layers indicate the directions of UC-Mn moment. The Roman number distinguishes the three equivalent Mn sites.

Image of FIG. 7.
FIG. 7.

Magnitude and direction of the net moment of Mn atoms as a function of the composition and configuration of the ferromagnetic layer.

Image of FIG. 8.
FIG. 8.

Comparison of the experimental and calculation results for the net magnetic moments in the Mn-Ir/(Ni-Co, Co-Fe, Fe-Ni) bilayer system. The circle marks represent the experimental results. As the calculation results, the bcc structure (triangle marks) was employed for Co3Fe1, Co2Fe2, and Co1Fe3, Fe4, and the fcc structure (square marks) was employed for the other compositions. This facilitated comparison with the results of the experimental analysis.

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/content/aip/journal/jap/110/12/10.1063/1.3672450
2011-12-30
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Uncompensated antiferromagnetic moments in Mn-Ir/FM (FM = Ni-Co, Co-Fe, Fe-Ni) bilayers: Compositional dependence and its origin
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/12/10.1063/1.3672450
10.1063/1.3672450
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