The monostable state and the bistable state are well known in systems with exchange bias, however systems in tri-stable or quadri-stable state are there any reports about them? Could someone give me references about these states.
some reports can simply be found in the internet, e.g. http://or.nsfc.gov.cn/bitstream/00001903-5/181469/1/1000014265984.pdf. However, often these terms are simply not used while the authors mean the same as you. One example from my group can be found here http://www.andreatillmanns.de/JApplPhys_109_083923.pdf.