Helen V. Gomonay, Svitlana V. Kondovych, Vadim M. Loktev
Nanoelectromangetomechanical systems (NEMMS) open up a new path for the
development of high speed autonomous nanoresonators and signal generators that
could be used as actuators, for information processing, as elements of quantum
computers etc. Those NEMMS that include ferromagnetic layers could be
controlled by the electric current due to effects related with spin transfer.
In the present paper we discuss another situation when the current-controlled
behaviour of nanorod that includes an antiferro- (instead of one of ferro-)
magnetic layer. We argue that in this case ac spin-polarized current can also
induce resonant coupled magneto-mechanical oscillations and produce an
oscillating magnetization of antiferromagnetic (AFM) layer. These effects are
caused by \emph{i}) spin-transfer torque exerted to AFM at the interface with
nonmagnetic spacer and by \emph{ii}) the effective magnetic field produced by
the spin-polarized free electrons due to $sd$-exchange.The described nanorod
with an AFM layer can find an application in magnetometry and as a
current-controlled high-frequency mechanical oscillator.
View original:
http://arxiv.org/abs/1202.4181
No comments:
Post a Comment