2017 Impact factor 1.947
Special Topics

EPJ B Highlight - Futuristic data storage based on controlling the interactions between nanodots magnetic ‘mood’ twirls

Force microscopy image of the magnetisation structure for a part of the array of square elements.

Better understanding of the changing magnetic state of nanometric squares in an array could be the basis for future ultrahigh density data storage

The magnetisation of nanometric square material is not fixed. It moves around in a helical motion. This is caused by the electron whose degree of freedom, referred to as spin, which follows a precession motion centred on the middle of a square nano-magnet. To study the magnetisation of such material, physicists can rely on two-dimensional arrays of square nanomagnets. In a paper published in EPJ B, P. Kim from the Kirensky Institute of Physics, associated with the Russian Academy of Sciences, in Krasnoyarsk, Siberia, Russia, and colleagues have devised a new model taking into account the factors affecting the magnetic interaction between individual nanomagnets. Better controlling such nanomagnets arrays could have applications in ultrahigh density data storage,in an electronic application called spintronics exploiting electron spins and its magnetism, and in micro- and nanosurgery controlled by magnets.

The development of high-density data storage devices requires the highest possible density of elements in an array. However, the closer they are together, the greater the magnetic interactions between individual magnetic nanosquares. This translates as multiple magnetic resonance lines instead of the single resonance line that exists when these squares are further apart. This means that this multiple resonance stems from the several types of vibrational modes across the individual nanomagnets aligned with several vibrational modes of the overall array—instead of a single vibrational mode when the squares are further apart.

The originality of this work lies in the square geometry of the chosen nanomagnet. Unlike previous studies using different geometries, this work examines various combinations of polarity and chirality in arrays of a large number of elements.

Managing Editors
Anne Ruimy (EDP Sciences) and Sabine Lehr (Springer-Verlag)
Dear Sabine,
For me it was a great pleasure to work with you, Christian and Isabelle. All questions have been resolved very fast. And amiability and competence of Isabelle are inestimable. Best regards,

Natasha Kirova, CNRS & University Paris Sud, Orsay, France
Editor EPJ Special Topics 222/5, 2013

ISSN: 1951-6355 (Print Edition)
ISSN: 1951-6401 (Electronic Edition)

© EDP Sciences and Springer-Verlag