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纳米复合永磁材料是由软磁性相和硬磁性相在纳米尺寸复合而成,其基体相可以是软磁性相也可以是硬磁性相,两相的边界可以连续变化。为获得高的磁性能要求,硬磁性相的磁晶各向异性尽量高,而软磁性相要有尽可能高的饱和磁化强度;两相的晶粒尺寸达到纳米量级;在两相晶粒界面处交换耦合相互作用发挥显著作用。虽然两相的磁晶各向异性相差很大,但在交换耦合相互作用下,当有外磁场作用时,软磁性相反向磁化成核变得困难,因而提高了矫顽力。对这段文字理解正确的一项是:
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAA5ElEQVRYR2NkGGDAOMD2M+B0wKpVq9huv/jbxPD/fxwDA4MkhQ59zsDIuEhVgrkuLCzsF7JZOB3QOml5B8P//+UUWoyqnZGxszovsoI4B0xc9gyfzxmZmb2rcsK3IRvWMWm599///7fgcfTz6vwoKWId8B+f75kZGX0q8iK3kugAhur8KJRQxx0FE5fhdQC5UTPqgNEQGA2B0RAYDYHREBgNgaETAuTW96TqG7yt4tbRFhGRIQBqHTP9+8dIoDUMTxqk5AK8zXKYiaDWMYhNpANIaJYPdMdkwLtmpOZnctUPeDkAAP6tmiH1ggTLAAAAAElFTkSuQmCC)
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参考解析:
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