Conversion from volume magnetization emu/cm3 to emu/g is done by dividing M to density. This is what B.D. Cullity explains in definitions and units section. But in our magnetometer , data files are reported in emu unit. So I can divide it to g in which I measure the amount of sample before measurement in order to see magnetization in emu/g unit.

All depend on magnetization units. Our vibrating sample magnetometer obtains the magnetization as magnetic moment M of sample mass unit M/m (emu) (1), but magnetization is magnetic moment of sample volume unit I=M/V (2). So This two magnetizations connect as I (2) = (1 in emu) multiply by d (density of material).

My dear the first I would like to say thanks for all the answers. But I mean to calculate the density of the magnetic measurements because it can be calculated in two ways. So it results in a variety of different works of different authors are different for the same alloy. I checked it and the same Calculation of density for a specific composition of the alloy may be the reason for these differences.

Usually we calculated the density of samples by hydrostatical weighting method.

In addition to Artur Braun: the increase in density of material leads to reducing of interatomic distances obviously. Boron is non magnetic component, so it should not contribute to overall magnetization. Zircon is paramagnetic, so it also not contribute to the magnetization. The last is cobalt, which as well as iron is ferromagnetic. In general, looking at the composition of this material (and the big share of iron and cobalt together) at first glance this material should be ferromagnetic. The exchange interaction governs the magnetic behaviour of whole system, and it strongly depends on interatomic distances between magnetic ions. In case of well ordered (crystalline) materials the magnetic ordering is related to structural ordering. In this case the size of unit cells will determine what kind of magnetic properties will be revealed. It is not the case with amorphous materials however. As You know, the structural disorder that exists in amorphous structure causes, that local environment of magnetic ions can be different. The boron and zirconium can appear in between magnetic ions, lowering their mutual influence and finally lower the exchange interactions. But, if this situation occurs when material is previously antiferromagnetic, dopants (boron and zirconium) can cause change of magnetic properties to ferromagnetic. Of course, the total magnetization will depend on the entire sample volume, so the resultant state is average.

For example, by lowering the distances between Fe atoms in pure Fe phase (applying pressure, increasing density) one can change its magnetic properties from ferromagnetic to antiferromagnetic.

In conclusion, the change of magnetic properties can vary, depending on starting state, chemical composition etc., and there is no simple 'always true' explanation.