2007/08/31 by Chinping Chen, Lin He, Yonghua Leng +2
Chemistry · Engineering · Physics and Astronomy · #Analytical Chemistry (journal) #Chemistry #Coercivity #Condensed matter physics #Curie temperature #Ferromagnetism #Hysteresis #Magnetic field #Magnetic hysteresis #Magnetic properties of thin films #Magnetization #Materials science #Metallic Glasses and Amorphous Alloys #Paramagnetism #Phase (matter) #Physics #Spin glass #Theoretical and Computational Physics #cond-mat.mtrl-sci
paper · pdf · doi:10.1063/1.3155997
published as J. Appl. Phys. 105(12), 123923 (2009) · 25 pages, 8 figures, 1 table, J Appl Phys In press
arxiv created 2009/05/30 · openalex publication_date 2009/06/15 · arxiv updated 2015/05/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Magnetic properties of Ni3C nanoparticles, about 40 nm in diameter, have been investigated. The sample exhibits weak ferromagnetic (FM), spin-glass (SG), and paramagnetic (PM) properties by alternating current susceptibility and direct current magnetization measurements. The freezing temperature of the SG phase at zero applied field is determined as TF0∼11.0 K. At T>TF0, a very weak ferromagnetism has been observed over a strong PM background. The Curie temperature TC is shown to exceed 300 K, and the ferromagnetism at 300 K is determined as about 0.02 emu/g∼6.7×10−4 μB per Ni3C formula unit. An anomalous dip appears in the temperature dependent coercivity HC(T) near the freezing temperature TF0. It reflects the distortedly reduced coercivity in the M(H) hysteresis loop measured at T∼TF0 with the applied sweeping field approaching H=0. This is attributable to the interaction between the SG and the weak FM phases. The possible origin of the magnetic moments that account for the observed FM, SG, and PM properties is discussed.