Spin-glass-like behavior and related properties of aluminum-based Al−Y−RE−Ni (RE=Gd, Dy) amorphous alloys

Magnetic properties of the following alloys: Al87Y5Ni8, Al87Y4Gd1Ni8, Al87Gd5Ni8, Al87Y4Dy1Ni8, and Al87Dy5Ni8 were studied by means of magnetic, electrical transport, and heat capacity measurements. Low temperature isotherms, magnetization versus magnetic field, were analyzed numerically to obtain distribution of magnetic moments in the interacting clusters system. The resistivity ρr(T) and specific heat C(T)/T data indicate a spin-glass-like magnetic state for the alloys with RE=Gd or Dy. The obtained distribution of magnetic moments reveals the presence of small clusters of Ni separated by magnetic RE/Ni regions which exhibit a frustration. We found that in the Al87Y5Ni8 alloy, Ni atoms form only two types of magnetic clusters with about 70 or 300 atoms. Doping of the based system by RE atoms leads to a reduction of Ni clusters magnetic moment via breaking off Ni−Ni ferromagnetic interaction within the cluster. We also found that resistivity ρr(T) of the investigated amorphous alloys Al−Y−RE−Ni is almo...

[1]  G. Haneczok,et al.  Influence of rare earth elements on crystallization of Fe82Nb2B14RE2 (RE = Y, Gd, Tb, and Dy) amorphous alloys , 2011 .

[2]  G. Haneczok,et al.  Effect of Gd and Fe doping on magnetic properties of Al87Y5Ni8 amorphous alloy , 2009 .

[3]  J. Deniszczyk,et al.  Electronic structure, magnetic properties and electrical resistivity of the Fe2V1−xTixAl Heusler alloys: experiment and calculation , 2006, Journal of physics. Condensed matter : an Institute of Physics journal.

[4]  P. Tiberto,et al.  Granular Cu-Co alloys as interacting suparparamagnets , 2001 .

[5]  M. Respaud.  Magnetization process of noninteracting ferromagnetic cobalt nanoparticles in the superparamagnetic regime: Deviation from Langevin law , 1999 .

[6]  A. Inoue.  Amorphous, nanoquasicrystalline and nanocrystalline alloys in Al-based systems , 1998 .

[7]  J. Mydosh.  Disordered magnetism and spin glasses , 1996 .

[8]  S. Majetich,et al.  Superparamagnetism in carbon-coated Co particles produced by the Kratschmer carbon arc process. , 1994, Physical review. B, Condensed matter.

[9]  R. Dunlap,et al.  Magnetic and thermal properties of amorphous Al-Gd-TM (TM=Fe, Cu) alloys , 1993, Journal of Materials Science.

[10]  S. Dhar,et al.  False heavy fermions , 1990 .

[11]  Wagner,et al.  Structural effects on the superconducting and magnetic behavior of aluminum-rich metallic glasses. , 1989, Physical review. B, Condensed matter.

[12]  S. Poon,et al.  Synthesis and Properties of Metallic Glasses That Contain Aluminum , 1988, Science.

[13]  A. Inoue,et al.  Aluminum-Based Amorphous Alloys with Tensile Strength above 980 MPa (100 kg/mm2) , 1988 .

[14]  S. Poon,et al.  Magnetic-cluster description of spin glasses in amorphous La-Gd-Au alloys , 1978 .

[15]  F. Brouers.  Temperature dependence of electrical resistivity in highly resistive alloys , 1978 .

[16]  K. Buschow,et al.  Intermetallic compounds of rare-earth and 3d transition metals , 1977 .