Switching on superferromagnetism

Anu Arora

doi:10.1103/PhysRevMaterials.3.024403

2019-02-08

DOI：10.1103/PhysRevMaterials.3.024403

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摘要

En 中文

Recent results in electric-field control of magnetism have paved the way for the design of alternative magnetic and spintronic devices with enhanced functionalities and low power consumption. Among the diversity of reported magnetoelectric effects, the possibility of switching on and off long-range ferromagnetic ordering close to room temperature stands out. Its binary character opens up the avenue for its implementation in magnetoelectric data storage devices. Here we show the possibility to locally switch on superferromagnetism in a wedge-shaped polycrystalline Fe thin film deposited on top of a ferroelectric and ferroelastic BaTiO3 substrate. A superparamagnetic to superferromagnetic transition is observed for confined regions for which a voltage applied to the ferroelectric substrate induces a sizable strain. We argue that electric-field-induced changes of magnetic anisotropy lead to an increase of the critical temperature separating the two regimes so that superparamagnetic regions develop collective long-range superferromagnetic behavior.

Keyword:

ELECTRIC-FIELD CONTROL

MAGNETIC-ANISOTROPY

CURIE TRANSITION

PHASE-TRANSITION

ULTRATHIN FE

TEMPERATURE

INTERFACE

STRAIN

FILMS

NANOMAGNETS

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Physical Review Materials

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3.4

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centre national de la recherche scientifique (cnrs)

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Helmholtz Association

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helmholtz-zentrum fuer materialien und energie gmbh (hzb)

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Universite Paris Saclay

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