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. 2016 Mar 21;7:11050. doi: 10.1038/ncomms11050

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Room-temperature hysteresis loops of sample A (x=0.42, with a Cu capping layer) measured by (a) VSM and element-specific XMCD for (b) Gd, (c) Fe, (d) Co and (e) Ni. Schematic illustrations of the sample magnetic configuration at various stages of the reversal are shown in f–i, respectively. In the layer structure, from top to bottom, the layers are GdFe (green), GdO_y and GdFe mixture (white), NiCo (blue) and NiCoO (black), respectively. Arrows in the layers indicate the magnetization directions.