Control and investigation of new magneto-electric coupling at surfaces of single magnetic metal nano clusters

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With our scanning tunneling microscopy setups we applied electric filed pulses on surfaces of Fe nano clusters. Transitions between bcc ferromagnetic and fcc antiferromagnetic phases were successfully controlled by the pulses with a space resolution of 1nm. Phase diagram was made. Lifetime of the phase transition was measured and its temperature dependence was confirmed. We have tried to find the magnetoelectric coupling in other metallic surfaces. Ni nano clusters with co-existence of bcc and fcc phases were successfully fabricated by growing monolayer Ni film on Fe(110)-whisker.