J4 ›› 2010, Vol. 48 ›› Issue (02): 299-302.
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JIANG Wei di, GONG Jie, JIAO Zhi wei
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The Cr/Gd bilayer was deposited by magnetron sputtering method, where the Curie temperature TC of the ferromagnetic Gd layer was less than the Néel temperature TN of the antiferromagnetic Cr layer. The temperature dependence of the magnetic properties of the film was characterized by means of vibrating\|sample magnetometer (VSM). It was shown that the Cr/Gd bilayer exhibited quite different behaviors from those of the FM/AFM bilayers with TC>TN. We have observed that the Gd layer persisted in the ferromagnetic phase even at T>TC. The coercivity HC of the film does not vary monotonously with temperature. HC decreases with temperature increase in a temperature range of 80~205 K, exhibiting a minimum value at T=205 K, and then goes up until reaching a peak at T=255 K, at 255 K<T<295 K, the coercivity decreases sharply with temperature, when T>295 K, however, HC increases with temperature increase. The experimental results indicate that the magnetic ordered temperature and coercivity of the ferromagnetic layer are strongly influenced by the interfacial exchange coupling between the Gd and Cr layers.
Key words: ferromagnetic/antiferromagnetic film, coercivity, exchange couping, Cr/Gd bilayer
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JIANG Wei-Dai, GONG Jie, JIAO Zhi-Wei. Magnetic Properties of Cr/Gd Bilayers[J].J4, 2010, 48(02): 299-302.
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