Vsm mainly focused on room temperature but we can take it in below room temperature and high temperature also it depends on the application u choose for your magnetic nano particles
It is possible to make VMS measurements at different temperatures. This will depend on the equipment used. Usually a Physical Property Measurement System (PPMS) offers this possibility. You can obtain some information of the anti-ferromagnetic behavior with Magnetization vs. Temperature measurements.
based on the moment vs applied field graph and nature of the sample, we may come to know the magnetic behavior of the material. most probably if the loop is linear then it may be a AFM and may be even identified at room temperature