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Publication

Magnetic Hysteresis in Er Trimers on Cu(111)

Harald Brune, Stefano Rusponi, Marina Pivetta, Jan Gui-Hyon Dreiser, Fabio Donati, Christian Wäckerlin, Aparajita Singha, Romana Baltic
2016
Journal Articles

Abstract

We report magnetic hysteresis in Er clusters on. Cu(111) starting from the size-of three atoms. combining Xray magnetic circular dichroism, scanning tunneling microscopy, and mean-field nucleation theory, we determine the size dependent magnetic properties of the Er clusters. Er atoms and dimers-are paramagnetic, and their easy magnetization axes are oriented in-plane. In contrast, timers and bigger dusters exhibit magnetic hysteresis at 2.5 K with a relaxation time of 2 min at 0.1 T and out-of-plane easy axis. This appearance of magnetic stability for trimers coincides with their enhanced structural stability.

Official source

https://infoscience.epfl.ch/entities/publication/bf80ce88-c8a8-48db-9336-d5f749191891

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Harald Brune, Stefano Rusponi, Marina Pivetta, Jan Gui-Hyon Dreiser, Fabio Donati, Christian Wäckerlin, Aparajita Singha, Romana Baltic
2016
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/bf80ce88-c8a8-48db-9336-d5f749191891

About this result

Ontological neighbourhood

Physics

Condensed matter physics: Phase transitions

Related concepts (24)

Magnetic hysteresis

Magnetic hysteresis occurs when an external magnetic field is applied to a ferromagnet such as iron and the atomic dipoles align themselves with it. Even when the field is removed, part of the alignment will be retained: the material has become magnetized. Once magnetized, the magnet will stay magnetized indefinitely. To demagnetize it requires heat or a magnetic field in the opposite direction. This is the effect that provides the element of memory in a hard disk drive.

Magnetic anisotropy

In condensed matter physics, magnetic anisotropy describes how an object's magnetic properties can be different depending on direction. In the simplest case, there is no preferential direction for an object's magnetic moment. It will respond to an applied magnetic field in the same way, regardless of which direction the field is applied. This is known as magnetic isotropy. In contrast, magnetically anisotropic materials will be easier or harder to magnetize depending on which way the object is rotated.

Hysteresis

Hysteresis is the dependence of the state of a system on its history. For example, a magnet may have more than one possible magnetic moment in a given magnetic field, depending on how the field changed in the past. Plots of a single component of the moment often form a loop or hysteresis curve, where there are different values of one variable depending on the direction of change of another variable. This history dependence is the basis of memory in a hard disk drive and the remanence that retains a record of the Earth's magnetic field magnitude in the past.

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