Zero-field magnetization

In 1962 Heller and Benedek made aeeiirate measurements of the zero-field magnetization of the antiferromagnet MnF2 as a fiinetion of temperature and reported a p of 0.335 0.005, a result supporting an experimental parallelism between fluids and magnets. 

Figure 9.7 Upper graph (a) showing zero zero field magnetic entropy for the same, field magnetic contribution to the heat (Taken from Ref. [26] with permission from...

Fig. 27 Magnetic heat capacity for PhBABI for 7 < 100 K showing variation with external magnetic field (left) zero-field magnetic heat capacity showing fits (right) to ID AFM chain, 2D AFM square planar, 2D AFM square planar bilayer, singlet-triplet spin pairing (ST), and spin ladder models.

The excess function appropriate to this problem is the reduced (A) zero-field magnetic susceptibility (A g) defined by the expression... 

Assignment confirmed by deuteration. hfs due to protons of neighbouring molecules also observed. Zero-field magnetic resonance. 

Zero-field magnetic resonance. Nearly isotropic. Two different sites or wrong interpretation, deuterated species also studied. Zero-field magnetic resonance. Species may also be dissociated with small hfs due to H,. Similar species from methyl- and ethylesters also studied. ... 

Pig. 2.46 The temperature dependence of the effective Curie constant, determined from zero-field magnetization (insets) for nanopowders CoPt-6 (Panel (a)) h CoPt-3 (Panel (b)) [62]... 

Fig. 131. Na2Ni"Fe "F,. Temperature dependence of l/x and the zero field magnetization a, above and below the Curie temperature 7 =88 K, respectively [72H13].

Let us recall the usual process. The sample is cooled at once without applied field from a temperature where all the particles are in the superparamagnetic state until the lowest temperature Afterward a field is applied and the measurement is performed increasing the temperature. In fact, if the magnetization in the superparamagnetic state has to be studied, the above condition on the initial temperature must be fulfilled. But if only Tg is of interest, it is sufficient that the magnetic moments m of the particles are frozen in random orientation at This can easily be checked from the zero field magnetization value, which must be equal to zero. 

Fig. 156. NajNiFeF,. Reduced temperature dependence of the zero field magnetization ( ) derived from suscepti-bility measurements and of the sublattice magnetization ] /n,(l 10,002) derived from the magnetic contribution to the (110,002) peak. The solid line corresponds to the...

Fig. 196. [(CH3)jNH]CoCIj 2H20 single crystal. Temperature dependence of zero-field magnetic susceptibilities measured along the a and c axes. The results of measurements along the a axis on two different crystals are shown [73L12].

Fig. 264. Na2NiAlF7. Temperature dependence of the approximate zero field magnetization. As a guide to the eye the line corresponds to a (1 — T/0cf - law [73H8].

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