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Magnetic hysteresis is studied in the orthoferrites ErFeO3 and TmFeO3 using the single crystal samples of millimeter dimensions. It is shown that in both materials one observes a temperature transition manifesting itself through the temperature hysteresis of the magnetic moment and a peculiar temperature evolution of the field hysteresis loop shapes near this transition. Experiments rule out the hypothesis that the ordering of the orthoferrite¡¯s rare-earth magnetic moments plays an
important role in these phenomena. The hysteresis curves can be explained by a few-domain magnetic state of the samples that results from the weak ferromagnetism of the orthoferrites. The phenomenon is generic for weak ferromagnets with temperature dependent magnetization. A large characteristic magnetic length makes the behavior of the relatively big samples analogous to that observed in the nanosize samples of strong ferromagnets.
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°®ÓëÓêÏÂ: ½ð±Ò+1 2013-12-03 07:52:50
xiehuaiyan: ½ð±Ò+15, ·­ÒëEPI+1, ¡ïÓаïÖú, ·­ÒëµÄ²»¹»×¼È· 2013-12-03 11:11:27
Magnetic hysteresis is studied in the orthoferrites ErFeO3 and TmFeO3 using the single crystal samples of millimeter dimensions.
¶ÔÔÚÄÉÃ׳ߴçϵÄÕýÑõÌåErFeO3ºÍ TmFeO3µÄµ¥¾§ÑùÆ·µÄÑо¿ÏÔʾÁ½ÖÖ²ÄÁÏ


It is shown that in both materials one observes a temperature transition manifesting itself through the temperature hysteresis of the magnetic moment and a peculiar temperature evolution of the field hysteresis loop shapes near this transition.
ÏÔʾÁ½ÖÖ²ÄÁÏËüÃǶ¼·þ´ÓζÈת»»À´ÏÔʾ×Ô¼ºµÄ´æÔÚ,ͨ¹ýζȳÙÖÍ(´Å¾ØµÄζȳÙÖÍ)ºÍÒ»ÖÖÆæÌصÄζȱ仯(¿¿½üÕâ¸öת»»µÄ´ÅÖÍ»ØÏßÐγɵÄ)


Experiments rule out the hypothesis that the ordering of the orthoferrite¡¯s rare-earth magnetic moments plays an important role in these phenomena.
ʵÑéÅųýÁËij¸ö¼ÙÉè,Õâ¸ö¼ÙÉèÊÇÕýÑõÌåÖи÷Ï¡ÍÁ´Å¾ØµÄ˳ÐòÊÇÔÚÕâ¸öÏÖÏóÖÐÆðÖØÒª×÷ÓÃ.

The hysteresis curves can be explained by a few-domain magnetic stateof the samples that results from the weak ferromagnetism of the orthoferrites.
´Ë´ÅÖÍ»ØÏß¿ÉÒÔÕâÑù½âÊÍ,ÑùÆ·ÖеÄÉÙÁ¿µÄ´Å³ë״̬ԴÓÚÕýÑõÌúµÄÈõÌú´ÅÐÔ.
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The phenomenon is generic for weak ferromagnets with temperature dependent magnetization.
´ËÏÖÏóÊÇÒ»°ãµÄ,¶ÔÓÚÈõÌú´ÅÌå˵µÄ,ËüÃÇÓµÓÐÒÀÀµÓÚζȵĴÅÐÔ.

A large characteristic magnetic length makes the behavior of the relatively big samples analogous to that observed in the nanosize samples of strong ferromagnets.
Ò»¸öºÜ³¤µÄÌØÐÔ´ÅÂ·ÖÆÔìÁËÕâÖÖ½á¹û(Ïà¶Ô´óµÄÑù±¾µÄ±íÏÖÀàËÆÓÚËù¹Û²ìµ½µÄÄÉÃ׳ߴçÇ¿Ìú´ÅÌåµÄÐÐΪ)

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