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5) Magnetic measurements: in line 216 it is written ¡°remanence and coercivity are zero¡±. Is it Mr=0 emu/g and Hc=0Oe or this values are close to zero like Mr a few emu/g and Hc= over a dozen Oe, what is common for nanosized soft magnetic spinel ferrites? This needs clarification
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8Â¥: Originally posted by ÓÖ¸öÆßÄê at 2015-06-19 15:26:00
ÎÒ¾õµÃÈ·¶¨ÎÞÒÉÁË£¬Äã¿ÉÒÔ·Å´ó×ø±êÔ­µã£¬Èç¹û½ÃÍçÁ¦Ð¡ÓÚ10 ×óÓÒ£¬Ê£´ÅÒ²ÊÇÁãµã¼¸£¬Äã¾Í¿ÉÒÔis the characteristic of a typical superparamagnetism. Ò»¶¡µãµÄ½ÃÍçÁ¦ºÍÊ£´Å ¿ÉÄÜÊÇ  MPMS ÀïµÄ²ÐÓà´Å³¡Ôì³ÉµÄ¡£±ÈÈç ...

Ö÷ÒªÊÇÕâ¾ä»°²»ÊǺÜÀí½â£¬ÒªÔõô»Ø´ðÄ᣿what is common for nanosized soft magnetic spinel ferrites?
10Â¥2015-06-20 09:00:06
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zhudan0921: ½ð±Ò+5 2015-06-19 08:53:47
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2Â¥2015-06-18 22:14:27
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zhudan0921: ½ð±Ò+5 2015-06-19 08:53:52
For soft magnetic spinel ferrites, the remanence and coercivity are strongly dependent on the particle size. For a multi domain sample, the coercivity may changes from several tens Oe to hundred Oe, and the  remanence is dependent on the sample weight (it should not be zero any way).  If your sample is in single domain state, then it is superparamagnetic and the coercivity  and  remanence should be zero.

You can distinguish superparamagnetic from ferri/ferromagnetic state by the particle size, or by carry out ZFC-FC measurement.
3Â¥2015-06-18 22:46:34
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