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zhudan0921金蟲(chóng) (小有名氣)
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[求助]
關(guān)于磁性問(wèn)題的請(qǐng)教,急!。 已有2人參與
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小弟對(duì)磁性不是很懂,不太明白審稿人的意思,不知該如何回答,還請(qǐng)懂這方面的牛人幫幫忙。下面是審稿人的意見(jiàn): 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 |
新蟲(chóng) (小有名氣)
木蟲(chóng) (著名寫(xiě)手)
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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. |
金蟲(chóng) (著名寫(xiě)手)
金蟲(chóng) (小有名氣)
金蟲(chóng) (小有名氣)
金蟲(chóng) (小有名氣)
木蟲(chóng) (著名寫(xiě)手)
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我覺(jué)得確定無(wú)疑了,你可以放大坐標(biāo)原點(diǎn),如果矯頑力小于10 左右,剩磁也是零點(diǎn)幾,你就可以is the characteristic of a typical superparamagnetism. 一丁點(diǎn)的矯頑力和剩磁 可能是 MPMS 里的殘余磁場(chǎng)造成的。比如我們實(shí)驗(yàn)室的,即使是加的零場(chǎng),其實(shí)有個(gè) -20Oe 的殘場(chǎng)在。如果你想更進(jìn)一步證明,可以掃一個(gè) ZFC-FC 曲線。ZFC 和 FC 會(huì)在低溫分叉,高溫重合,ZFC 的峰值就對(duì)應(yīng)于 blocking temperature |
金蟲(chóng) (小有名氣)
金蟲(chóng) (小有名氣)
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