Hysteresis depends on the way the core material is used.
In a high permeability "closed" magnetic circuit, like ferrite cores with very small gap or high permeability iron powder cores, hysteresis becomes easy to view on oscilloscope.
However, if ferrite is just used as a big center rod to collect field lines of all turns (and get inductance proportional to n^2 regardless of winding dimensions) and the magnetic circuit is left open (and thus low permeability), then oscilloscope shows no appreciable hysteresis. Low permeability iron powder toroids produce the same effect, no visible hysteresis.
In general, non-linearity is a consequence of high permeability because obtaining high permeability involves pushing materials and its internal mechanisms into non-linear territory. In low permeability inductor designs, more energy is stored in the air and less in the core material itself.
