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Direct observation of spin configuration in an exchange coupled Fe/NiO(100) system by x-ray magnetic circular- and linear- dichroism photoemission electron microscope
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10.1063/1.3647776
/content/aip/journal/jap/110/8/10.1063/1.3647776
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/8/10.1063/1.3647776
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Figures

Image of FIG. 1.
FIG. 1.

(Color) PEEM images for the cleaved NiO(100) surface. The direction of light incidence and the symmetric axes of the crystal are shown. The T- and S-domain boundaries are determined from these images and others taken at different azimuthal angles. The shape of a single T-domain obtained in this way is indicated by an orange curve. Three S-domain (S1, S2, and S3) boundaries in the single T-domain are shown by red, green, and blue curves. Only these three domains are focused on for the discussion, and the other S-domains are not assigned. (a) Image obtained using the XLD effect at the O K edge, which reflects the T-domain structure. (b) Same as in (a) but using the XMLD effect at the Ni L 2 edge. This reflects the S-domain structure. (c) Same as in (a) but at a different azimuthal angle. (d) Same as in (b) but at a different azimuthal angle. The light direction is same as in (a).

Image of FIG. 2.
FIG. 2.

(Color) (a) AAD obtained for the three S-domains (S1, S2, and S3) shown in Fig. 1(b). (b) Calculated AAD based on the cluster model including crystal symmetry. The calculation was performed for circularly polarized light and for all the magnetization directions. Here only the curves which can reproduce the experimental AAD in (a) are shown (, [112], and ).

Image of FIG. 3.
FIG. 3.

(Color) PEEM images for the Fe/NiO(110) system. The field of view was set to the same area as in Fig. 1. The direction of the light incidence is shown. (a) Image obtained using the XLD effect at the O K edge, which reflects the T-domain structure of the NiO substrate. The orange curve indicates the boundary of a single T-domain. (b) Same as in (b) but using the XMLD effect at the Ni L 2 edge, which reflects the S-domain structure. Three S-domain (S1, S2, and S3) boundaries in the single T-domain in (a) are shown. As shown by the area surrounded by a pink circle, the spin direction seems to change from its initial situation in Fig. 1(d) due to Fe evaporation. (c) Image obtained using the XMCD effect at the Ni L 3 edge, which reflects the interface (mixture phase of Fe and NiO) domain structure. The spin directions of the interface region on the three S-domains of the substrate are indicated. These spin directions are determined from the AAD of the XMCD. (d) Same as in (c) but using the XMCD effect at the Fe L 3 edge.

Image of FIG. 4.
FIG. 4.

(Color) Schematic model of the spin configuration of the Fe/NiO system. The spin directions of the outermost Fe film and the interface region are shown together with the bulk AFM S-domains of the NiO substrate.

Image of FIG. 5.
FIG. 5.

(Color) Comparative PEEM images for Fe/NiO(100) in response to the magnetic field pulse. The zone boundaries of the S-domains of the NiO substrates are the same as those shown in Fig. 1. The spin directions of the FM domains of the Fe film are also indicated by arrows and have been determined from the AAD of the XMCD. The direction of the light incidence is shown by a yellow arrow. The direction of the field is almost parallel to [001]. (a) XMCD image at the Fe L 3 edge before applying the magnetic field pulse, reflecting the outermost Fe domain structure. The yellow curves are guides for the eye, indicating the FM domain boundaries. (b) Same as (a) but at the Ni L 3 edge, reflecting the interface domain. (c) XMLD image at the Ni L 2 edge before applying the magnetic field pulse, reflecting the bulk AFM NiO S-domains. (d) Same as (a) but after applying a 10 mT pulse. (e) Same as (d) but after a 11 mT pulse. (f) Same as (d) but after a 17 mT pulse. (g) Same as (d) but after a 21 mT pulse. (h) Same as (b) but after a 21 mT pulse. (i) Same as (c) but after a 21 mT pulse.

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/content/aip/journal/jap/110/8/10.1063/1.3647776
2011-10-20
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Direct observation of spin configuration in an exchange coupled Fe/NiO(100) system by x-ray magnetic circular- and linear- dichroism photoemission electron microscope
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/8/10.1063/1.3647776
10.1063/1.3647776
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