超順磁性是指當某些具有磁性的顆粒小於某個尺寸時,外場產生的磁取向力太小而無法抵抗熱擾動的干擾,而導致其磁化性質與順磁體相似。磁性顆粒變成超順磁性的臨界尺寸與溫度有關,像是在室溫鐵粒的臨界大小為12.5奈米,而在4.2K時半徑為2.2奈米還是鐵磁性的。

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