• Title/Summary/Keyword: antiferromagnetic

Search Result 244, Processing Time 0.031 seconds

Magnetic Susceptibility of the Single Crystal MnF2(1.5% EuF3) (단결정 MnF2(1.5% EuF3)의 자기 감수율)

  • Lee, Jun-Young;Nahm, Kyun;Kim, Chul-Koo
    • Journal of the Korean Magnetics Society
    • /
    • v.16 no.5
    • /
    • pp.261-263
    • /
    • 2006

  • In order to investigate the magnetic properties of Eu ions in the single crystal $MnF_2$, the temperature dependent magnetic susceptibilities of the antiferromagnetic $MnF_2$ and the single crystal $MnF_2$(1.5% $EuF_3$) with the rutile structures were measured in the temperature range from 4K to 300K. The detailed analysis of the measured susceptibilities showed that the magnetic susceptibility by the doping of the small amount $EuF_3$ in the antiferromagnetic single crystal $MnF_2$ follows the antiferromagnetic Curie-Weiss law with the negative paramagnetic Curie temperature similarly as in $MnF_2$. It was also found that Eu ion has +3 valence. This solves the long standing discrepancy on this problem.

  • https://doi.org/10.4283/JKMS.2006.16.5.261 인용 PDF KSCI

Magnetic Field Dependence of Torque Signals in Synthetic Antiferromagnetic Coupled CoFeB/Ru/CoFeB Thin Film (합성형 반강자성 결합 재료의 자기장 세기에 따른 토오크 신호 분석)

  • Yoon, Seok-Soo;Jun, Woo-Sang;Kim, Dong-Young
    • Journal of the Korean Magnetics Society
    • /
    • v.21 no.3
    • /
    • pp.83-87
    • /
    • 2011

  • We have analyzed the torque signals measured in synthetic antiferromagnetic (SAF) coupled CoFeB/Ru/CoFeB thin film, which signals were drastically changed at flopping field ($H_F$) and saturation field ($H_s$). The minimum value of negative uniaxial anisotropy constant ($-\;K_1$) was appeared at HF. The $-\;K_1$ was due to the zero net magnetization by the antiferromagnetic coupling between two ferromagnetic layers. Whereas, the biaxial anisotropy constant (K2) was induced in the field range of $H_F$ < H < $H_s$. The induced $K_2$ was originated from deviation angles between magnetization directions of two ferromagnetic layers. And at H > $H_s$, intrinsic uniaxial anisotropy constant of CoFeB layer was observed. These change of the anisotropy constant with magnetic field was explained by the magnetization process of two ferromagnetic layers based on Stoner-Wohlfarth model calculation for SAF thin film.

  • https://doi.org/10.4283/JKMS.2011.21.3.083 인용 PDF KSCI