Journal
PHYSICAL REVIEW LETTERS
Volume 107, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.247201
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Funding
- National Creative Initiative [2009-0081576]
- WCU [R31-2008-000-10059-0]
- Leading Foreign Research Institute through NRF [2010-00471, 2009-0079947, 20110006408]
- MEST
- POSTECH
- National Research Foundation of Korea [2009-0079947, 2010-00471] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We investigated the magnetic nature of Fe1/4TaS2 using x-ray absorption spectroscopy, photoemission spectroscopy, and first principles band calculations. The results show a large unquenched orbital magnetic moment (similar to 1.0 mu(B)/Fe) at intercalated Fe sites, resulting in a gigantic magnetic anisotropy (H-A similar or equal to 60 T). The magnetic coupling is well understood in terms of the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction, suggesting a novel RKKY ferromagnet with Ising-type spin states. We also found that this indirect exchange coupling between the neighboring Fe spins is ferromagnetic and maximized at the Fe-Fe distance of 2 x 2 superstructure.
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