• Proceedings of the Korean Magnestics Society Conference
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• 2014.05a
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• pp.85-85
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• 2014

• Progress in Superconductivity
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• v.11 no.2
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• pp.135-140
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• 2010

We propose a variational wave function for the ground state of the magnetic heavy fermion (HF) systems, in which both the Kondo and the RKKY interactions are variationally incorporated and the local f-orbital state exists as a linear combination of a full local moment state and a fully compensated state (mixed wave state). We describe the mechanism for the mixed wave ground state based on the large-N treatment of the Kondo lattice Hamiltonian added with RKKY interaction. With the mixed wave ground state we can explain several puzzling experiments in magnetic HF compounds such as a small value of local moment, coexistence of the antiferromagnetic (AFM) and the paramagnetic (PM) phases, local quantum criticality, etc.

• Proceedings of the Korean Magnestics Society Conference
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• 2004.06a
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• pp.172-173
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• 2004

• Proceedings of the Korean Magnestics Society Conference
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• 2004.06a
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• pp.66-67
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• 2004

• Proceedings of the Korean Magnestics Society Conference
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• 1992.10a
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• pp.16-17
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• 1992

• Proceedings of the Korean Magnestics Society Conference
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• 2002.12a
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• pp.194-195
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• 2002

Fe/Cr/Fe trilayers have attracted much interest from both theoretical and experimental aspects due to many novel magnetic properties such as antiferromagnetic coupling, giant magnetoresistance, oscillatory bilinear and biquadratic coupling [1]. In this work, we report that there is an oscillation of magnetic anisotropy with increasing intervening Cr layer thickness in Fe/Cr/Fe trilayers. (omitted)

• Journal of Magnetics
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• v.4 no.4
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• pp.128-130
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• 1999

We have measured the magnetization of Ni/Ag(Ni at %)/Ni (50$\AA$/30 $\AA$/50 $\AA$) trilayered films including Ni atoms inserted in non-magnetic Ag spacer. The magnetization as a function of applied field at 5 K and as a function of temperature at 100 Oe were investigated respectively using SQUID magnetometer. In these measurements peaks of magnetization at some critical temperatures were observed in all the samples. The antiferromagnetic coupling energy between neighboring Ni layers showed oscillatory behaviors according to the amounts of the Ni atoms inserted in Ag spacer. Loose spin model suggested by slonczews야 was used to explain such results.

• Proceedings of the Korean Magnestics Society Conference
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• 2011.12a
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• pp.13-13
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• 2011

• Proceedings of the Korean Magnestics Society Conference
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• 2017.05a
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• pp.215-215
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• 2017

• Journal of Magnetics
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• v.5 no.1
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• pp.13-15
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• 2000

We have investigated the finite temperature magnetic ordering in the quasi-two-dimensional Heisenberg antiferromagnetic system $(C_nH{2n+1}NH_3)_2MnCl_4$ with various chain lengths n. Our results far the transition temperatures and the exchange energies for long chain compounds are in marked contrast to previous expectations.