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이원준,최광용,윤성원,서병진,장지훈,P. K. Biswas,Ryan E. Baumbach,Eric D. Bauer 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.10
We report zero-field muon spin relaxation/rotation (ZF-μSR) measurements on the 4f-localized ferromagnets CeRu2X2B (X = Al, Ga) with Ising-type anisotropy. Our ZF-μSR spectra of CeRu2Ga2B with a Curie temperature at TC = 16.3 K show a well-defined muon procession at temperatures below TC. The extracted critical exponent of = 0.533 is close to the mean-field value of = 0.5. On the other hand, the isomorphic CeRu2Al2B exhibits an intriguing evolution of the ZF-μSR spectrum through a spin density wave/ferromagnetic transition at TC = 12.8 K with a subsequent magnetic anomaly at T = 6 K. Strikingly, the muon frequency decreases upon cooling to temperatures below TC and can be no longer resolved at temperatures below T. At the same time, the muon relaxation rate increases continuously at temperatures below TC. These give an indication of the development of an inhomogeneous and dynamic ferromagnetic state. The contrasting ferromagnetism between CeRu2Ga2B and CeRu2Al2B evidences that a certain type of intrinsic/extrinsic perturbation, for example, exchange frustration and defects/impurities, can exert a drastic impact on the local magnetic properties in a family of 4f-localized magnetic materials with frustration.
Imaging magnetic domains in vector magnetic fields via magnetic force microscopy
Dirk WULFERDING,Ilkyu YANG,Hoon KIM,Oscar AYALA-VALENZUELA,Minkyung LEE,Hee Cheul CHOI,Filip RONNING,Leonardo CIVALE,Ryan BAUMBACH,Eric BAUER,Joe THOMPSON,Roman MOVSHOVICH,Jeehoon KIM 한국진공학회 2016 한국진공학회 학술발표회초록집 Vol.2016 No.8