Antiferromagnetic Resonance of the Ho subsystem in Multiferroic HoMnO3


Antiferromagnetic Resonance of the Ho subsystem in Multiferroic HoMnO3

Kamemskiy, D.; Ozerov, M.; Cizmar, E.; Wosnitza, J.; Zvyagin, S. A.; Zhou, H. D.; Wiebe, C. R.

Multiferroic HoMnO3 is ferroelectric below Tc = 875 K and antiferromagnetically ordered below TN(Mn) = 75 K (Mn subsystem). In addition, at TN(Ho) approximately 5 K the Ho subsystem undergoes a transition into an antiferromagnetically ordered state. The coupling between the ferroelectric and antiferromagnetic order parameters in HoMnO3 has not yet been unambiguously explained, revealing the importance of geometrical frustrations and a complex interplay between the Ho and Mn magnetic subsystems. High-quality single-crystalline samples of HoMnO3 were studied by means of X-band (9.3 GHz) electron spin resonance spectroscopy. A relatively strong absorption was found below 5 K, which corresponds to the temperature of the magnetic ordering of the Ho subsystem. The observed mode exhibits a very pronounced anisotropic behavior and can be interpreted as an excitation within the antiferromagnetically ordered Ho subsystem.

  • Poster
    International Conference on Magnetism (ICM 2009), 26.-31.07.2009, Karlsruhe, Deutschland

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Publ.-Id: 12651