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- Thread starter Jeff Chen
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king vitamin

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More generally, in an arbitrary coordinate system, you assume that the system has a uniform magnetization given by

$$

\mathbf{M} = \langle \mathbf{S}_i \rangle = M \hat{e}

$$

where ##\hat{e}## is a unit vector in some direction. Now just choose your coordinate system such that the z direction points along ##\hat{e}##, and then you have ##\langle S^+ \rangle = \langle S^- \rangle = 0## in that coordinate system.

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