  Materials that change their magnetic properties in response to the external
stimuli have long been of interest for their potential applicability in
magnetic storage device, spintronics and smart magnetic materials. Organic
materials are suitable candidates for such materials due to their chemical
diversity, flexibility and designablity. However, most methods used for
changing magnetism are inefficient or destructive to the magnetic material.
Hence there is a need for innovation in this field. Here we report
high-performance magnetic control of a gas-responsive single-molecule magnet
(SMM). The results exhibit that the magnetic properties of the SMM can be
significantly changed according to the gas environment it is in and some of the
magnetic states can be reversibly transformed or coexistent in the SMM through
artificial control. More importantly, the monocrystalline structure of the SMM
remains unchanged during the transformation process except for slight change of
the lattice constant. Thus, this work opens up new insights into the
stimuli-responsive magnetic materials which have great prospects for
application in artificial design magnetic network and also highlight their
potential as smart materials.
