Magnetic phase transitions spin-flip

A summary of the magnetic phase transitions in the Invar alloy is thus that all transitions occur at much lower volumes than the ferromagnetic ground state volume, except the spin-flip transition, which is predicted to occur somewhere around this equilibrium volume, and which must therefore be taken into account in models for the Invar behaviour. 

The sensitivity of this intracavity technique (Sect. 1.2.3) can even be enhanced by modulating the magnetic field, which yields the first derivative of the spectrum (Sect. 1.2.2). When a tunable laser is used it can be tuned to the center vo of a molecular line at zero field = 0. If the magnetic field is now modulated around zero, the phase of the zero-field LMR resonances for AM = +1 transitions is opposite to that for AM = — 1 transitions. The advantages of this zero-field LMR spectroscopy have been proved for the NO molecule by Urban et al. [143] using a spin-flip Raman laser. 

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