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Title: Chemical, electronic, and magnetic structure of LaFeCoSi alloy: Surface and bulk properties

We investigate the chemical, electronic, and magnetic structure of the magnetocaloric LaFeCoSi compound with bulk and surface sensitive techniques. We put in evidence that the surface retains a soft ferromagnetic behavior at temperatures higher than the Curie temperature of the bulk due to the presence of Fe clusters at the surface only. This peculiar magnetic surface effect is attributed to the exchange interaction between the ferromagnetic Fe clusters located at the surface and the bulk magnetocaloric alloy, and it is used here to monitor the magnetic properties of the alloy itself.
Authors:
 [1] ;  [2] ; ; ; ; ;  [3] ;  [4] ; ;  [5] ;  [6] ;  [2] ; ;  [1]
  1. Dipartimento di Scienze, Università Roma Tre, I-00146 Rome (Italy)
  2. (Italy)
  3. Istituto Nazionale di Ricerca Metrologica (INRIM), I-10135 Torino (Italy)
  4. CNR, Istituto per lo Studio dei Materiali Nanostrutturati (ISMN), I-40129 Bologna (Italy)
  5. CNR, Istituto Officina dei Materiali (IOM), Lab. TASC, I-34149 Trieste (Italy)
  6. Laboratorio di Analisi di Superficie, Dipartimento di Matematica e Fisica, Università Roma Tre, I-00146 Rome (Italy)
Publication Date:
OSTI Identifier:
22304371
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 20; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CHEMICAL PROPERTIES; COBALT COMPOUNDS; CURIE POINT; ELECTRICAL PROPERTIES; ELECTRONIC STRUCTURE; EXCHANGE INTERACTIONS; IRON COMPOUNDS; LANTHANUM COMPOUNDS; MAGNETIC PROPERTIES; MAGNETIC SURFACES; QUATERNARY ALLOY SYSTEMS; SILICON COMPOUNDS; SURFACES