More temp leads to more activation of more ferromagnets, until it's too much, they get scattered randomly and the house of cards falls over (Curie temp).
The activation energy is all over the place, usually a blend is used (the exact mixture of Ni to Zn to Fe, and any dopants) to give some combination of properties for a purpose. Some, you'll see multiple humps in the mu(T) plot, as different energy bands become active.
Which might imply, and quite rightly so, it is true -- that, as temperature goes up, Bsat goes down. That is, there is more energy pushing the magnets out of alignment, so there are fewer able to line up with the applied field (if also more readily so -- high mu), even when driven heavily.
So it's actually very important to note that Tc is quite low for this material. That means the drop in Bsat is nearby too, and it would be very easy to heat up this part, with DC current, enough to also spoil its DC imbalance handling.
Or if not due to DC heating alone at room temperature, then it will severely limit your ambient temp range.
I'm rather surprised and perplexed why they went with NiZn here; it certainly makes it harder for your application.
Example:
Given the axes, this looks like it might be for nickel (it's from ResearchGate, I didn't read the article). The curve is similar for other materials, adjusted for low-temp Bsat (left intercept) and zero-field Tc (bottom intercept).
Tim
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