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Journal Article
Low-field magnetoelectric effect at room temperature
2010
Overview
Only few magnetoelectric materials, where magnetism and ferroelectricity are coupled, are known to exist at room temperature, and in most cases the magnetoelectric coupling is weak. The discovery of strong room-temperature magnetoelectric coupling in Sr
3
Co
2
Fe
24
O
41
at low magnetic fields is therefore a significant advance towards the practical application of multiferroics.
The discoveries of gigantic ferroelectric polarization in BiFeO
3
(ref.
1
) and ferroelectricity accompanied by a magnetic order in TbMnO
3
(ref.
2
) have renewed interest in research on magnetoelectric multiferroics
3
,
4
, materials in which magnetic and ferroelectric orders coexist, from both fundamental and technological points of view
5
,
6
,
7
. Among several different types of magnetoelectric multiferroic
8
,
9
, magnetically induced ferroelectrics in which ferroelectricity is induced by complex magnetic orders, such as spiral orders, exhibit giant magnetoelectric effects, remarkable changes in electric polarization in response to a magnetic field. Many magnetically induced ferroelectrics showing the magnetoelectric effects have been found in the past several years
10
. From a practical point of view, however, their magnetoelectric effects are useless because they operate only far below room temperature (for example, 28 K in TbMnO
3
(ref.
2
) and 230 K in CuO (ref.
11
)). Furthermore, in most of them, the operating magnetic field is an order of tesla that is too high for practical applications. Here we report materials, Z-type hexaferrites, overcoming these problems on magnetically induced ferroelectrics. The best magnetoelectric properties were obtained for Sr
3
Co
2
Fe
24
O
41
ceramics sintered in oxygen, which exhibit a low-field magnetoelectric effect at room temperature. Our result represents an important step towards practical device applications using the magnetoelectric effects.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
