光子磁矩没有垂直分量，是完全顺磁性的
The photon magnetic moment has not a perpendicular component and is fully paramagnetic
摘要：
我们的论文Phys. Rev. D \textbf{79}，093002（2009），其中显示了光子在磁化真空中传播的顺磁行为，在Phys. Rev. D \textbf{81}，105019（2010）中受到批评，甚至声称光子具有反磁分量。在这里，它表明，这种批评是不够的，所谓的“垂直分量”是由于一个错误，在区分消失项关于磁场$B$，或误以为一个标量产品的衍生物的并矢产品。对问题的物理方面也作了讨论。
英文摘要：
Our paper Phys. Rev. D \textbf{79}, 093002 (2009), in which it was shown the paramagnetic behavior of photons propagating in magnetized vacuum, is criticized in Phys. Rev. D \textbf{81}, 105019, (2010) and even claimed that the photon has a diamagnetic component. Here it is shown that such criticism is inadequate and that the alleged "perpendicular component" is due to a mistake in differentiating a vanishing term with regard to the magnetic field $B$, or either by mistaking the derivative of a scalar product as that of a dyadic product. A discussion on the physical side of the problem is also made.
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