Magnetic ordering in Ni-rich NiMn alloys around the multicritical point: Experiment and theory

Pampa Pal, Rudra Banerjee, Radheshyam Banerjee, Abhijit Mookerjee, Gopi Chandra Kaphle, Biplab Sanyal, J. Hellsvik, Olle Eriksson, P. Mitra, A. K. Majumdar, and A. K. Nigam
Phys. Rev. B 85, 174405 – Published 3 May 2012

Abstract

We have carried out an experimental study of Ni-rich NiMn alloys in a series of compositions across the multicritical point and determined the phase diagram within that range. We have observed ferromagnetic long-range order with reentrant spin-glass/ferro-spin-glass phase for x25, an antiferromagnetic long-range order around x37, and a gradual change from a canonical spin-glass state to a long-range antiferromagnetic phase in the intermediate composition region. In order to explain the experimental observations, we have examined the physical properties from a density functional based first-principals theoretical analysis and used it to understand the experimental results. Using atomic spin dynamics simulations based on the Landau-Lifshitz-Gilbert equation, we have found the aging behavior and anomalously slow relaxation of magnetization in the composition range where experiment observes spin-glassy behavior.

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  • Received 28 October 2011

DOI:https://doi.org/10.1103/PhysRevB.85.174405

©2012 American Physical Society

Authors & Affiliations

Pampa Pal*, Rudra Banerjee, Radheshyam Banerjee, and Abhijit Mookerjee

  • Department of Condensed Matter and Materials Science, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700098, India

Gopi Chandra Kaphle

  • Department of Physics, Tribhuvan University, Kathmandu, Nepal

Biplab Sanyal, J. Hellsvik, and Olle Eriksson

  • Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden

P. Mitra and A. K. Majumdar

  • Indian Institute of Science Education and Research, Kolkata, Mohanpur Campus, Mohanpur 741252, Nadia, West Bengal, India

A. K. Nigam

  • Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005, India

  • *Present address: Christopher Road H. S. School for Girls, 35 Christopher Road, Kolkata 700014, India.
  • S. N. Bose National Centre for Basic Sciences, Kolkata, India.

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Issue

Vol. 85, Iss. 17 — 1 May 2012

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