STATIC MAGNETIC-PROPERTIES OF THE MANY-SUBLATTICE ANTIFERROMAGNET CA2FE2O5

被引:31
作者
MARCHUKOV, P
GEICK, R
BROTZELLER, C
TREUTMANN, W
RUDASHEVSKY, EG
BALBASHOV, AM
机构
[1] UNIV MARBURG,INST MINERAL,W-3550 MARBURG,GERMANY
[2] ACAD SCI,INST GEN PHYS,MOSCOW 117942,RUSSIA
[3] MOSCOW POWER ENGN INST,MOSCOW 105835,RUSSIA
来源
PHYSICAL REVIEW B | 1993年 / 48卷 / 18期
关键词
D O I
10.1103/PhysRevB.48.13538
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have studied the magnetization of the antiferromagnet dicalcium ferrite Ca2Fe2O5 in magnetic fields up to 5.5 T and in the temperature range 5-330 K. Temperature dependences of the weak ferromagnetic moment m0 and susceptibilities along the main crystallographic axes have been measured. Effective intrinsic parameters, such as an exchange field and the Dzyaloshinskiy-Moriya field have been obtained as a function of temperature. Possible magnetic structures have been analyzed by means of comprehensive group-theoretical consideration and a phenomenological free energy has been derived. Problems involving hedgehog structure, parallel susceptibility, field-induced spin reorientation, magnitude of the Dzyaloshinskiy-Moriya interaction, and the origin of the weak ferromagnetism are also discussed. It is shown that Ca2Fe2O5 can be described as two canted antiferromagnets putting one into another with an antiferromagnetic interaction between the weak ferromagnetic components.
引用
收藏
页码:13538 / 13546
页数:9
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