Impurity spin resonance in antiferromagnetic FeCl2

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  • Impurity Spin Resonance in Antiferromagnetic FeCl<SUB>2</SUB>

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Electron spin resonance of Fe3+ and Mn2+ ions in antiferromagnetic FeCl2 was investigated at low temperatures using various microwave frequencies and pulsed magnetic fields. Experimental results show that these impurities in FeCl2 occupy mainly the substitutional position and couple with host Fe2+ spins by rather weak exchange interaction. Using the metamagnetic properties of FeCl2, these resonances were investigated both above and below the critical field Hc. The intralayer and interlayer exchange field H1 and H2 of these impurities were found by analysis to be<BR>H1(AF)=8.0 kOe H2(AF)=4.2 kOe for Fe3+ spins,<BR>H1(F)=21.6 kOe H2(AF)=13.8 kOe for Mn2+ spins,<BR>where AF and F mean the antiferromgnetic and ferromagnetic exchange interactions with Fe2+ spins, respectively. Interstitial impurity spin resonance was also found and the exchange interaction with neighboring Fe2+ spins is estimated.

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