Soft magnetic composites (SMCs) are effective as magnetic powder cores in power transformers. Currently, SMCs used in transformers are mostly prepared from NiZn ferrites. One example of this type of material is NiZnCu ferrite, whose working frequency limit is 40 MHz. Above this frequency, its large magnetic loss angle tangent ( tan δ m), approximately equal to 0.29 at 100 MHz, seriously impairs the property of transformers. Generally, the magnetic losses in the MHz frequency band result from eddy-current loss, domain wall resonance, and natural resonance, specifically the high natural resonance loss. A way to decrease it is by increasing the resonance frequency ( f r). However, the increase in f r is very difficult for the uniaxially anisotropic NiZnCu ferrite due to the Snoek limit. We present a composite of oriented Ce2Fe17N3 microflakes and polyurethane in this letter. Although its true permeability is not as high as that of NiZnCu, the f r reaches 7.5 GHz. As a result, the tan δ m at 100 MHz is decr...

中文翻译：

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具有易平面各向异性和高工作频率的Ce2Fe17N3微薄片的制备与研究

软磁复合材料 (SMC) 在电力变压器中用作磁粉芯是有效的。目前，用于变压器的SMCs主要由NiZn铁氧体制成。此类材料的一个示例是 NiZnCu 铁氧体，其工作频率限制为 40 MHz。在此频率以上，其较大的磁损耗角正切 (tan δ m)，在 100 MHz 时大约等于 0.29，严重损害了变压器的性能。通常，MHz频段的磁损耗是由涡流损耗、畴壁谐振和自然谐振引起的，特别是高自然谐振损耗。降低它的一种方法是增加谐振频率 (fr)。然而，由于 Snoek 限制，单轴各向异性 NiZnCu 铁氧体的 fr 增加非常困难。我们在这封信中介绍了一种由定向 Ce2Fe17N3 微薄片和聚氨酯组成的复合材料。虽然其真实磁导率不如 NiZnCu 高，但 fr 达到 7.5 GHz。因此，在 100 MHz 时的 tan δ m 降低了...