Quenching of enhanced magnetic order at Ni-Al alloy surfaces by segregated sulfur and by Ar+ impact

M. Polak; J. Deng; L. Rubinovich

doi:10.1016/0039-6028(96)00612-7

Quenching of enhanced magnetic order at Ni-Al alloy surfaces by segregated sulfur and by Ar⁺ impact

M. Polak, J. Deng, L. Rubinovich

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

A comprehensive study of effects of adsorbate and structural disorder on surface enhanced Curie temperature of Ni-Al solid-solutions is reported. A recently developed procedure for monitoring magnetic transitions by means of attenuations induced in the low-energy Auger electrons spectrum has been used. Sulfur segregation and argon bombardment were found to reduce the surface related Curie temperature in a similar, significant manner. Its particular dependence on coverage or ion dose is discussed in the framework of the Kirkwood correlational approximation which has been adapted for semi-infinite, spin-1/2 Ising ferromagnet with enhanced, but progressively randomized surface magnetic moments. The calculations fit the data with a single adjustable parameter reflecting the extent of S or Ar⁺ induced fluctuations in the Ni surface exchange coupling.

Original language	English
Pages (from-to)	381-385
Number of pages	5
Journal	Surface Science
Volume	357-358
DOIs	https://doi.org/10.1016/0039-6028(96)00612-7
State	Published - 20 Jun 1996

Keywords

Auger electron spectroscopy
Ising models
Magnetic surfaces
Ni alloys

ASJC Scopus subject areas

Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

Access to Document

10.1016/0039-6028(96)00612-7

Cite this

@article{ada69ce90a7043f9b0c8c29bd0b46736,

title = "Quenching of enhanced magnetic order at Ni-Al alloy surfaces by segregated sulfur and by Ar+ impact",

abstract = "A comprehensive study of effects of adsorbate and structural disorder on surface enhanced Curie temperature of Ni-Al solid-solutions is reported. A recently developed procedure for monitoring magnetic transitions by means of attenuations induced in the low-energy Auger electrons spectrum has been used. Sulfur segregation and argon bombardment were found to reduce the surface related Curie temperature in a similar, significant manner. Its particular dependence on coverage or ion dose is discussed in the framework of the Kirkwood correlational approximation which has been adapted for semi-infinite, spin-1/2 Ising ferromagnet with enhanced, but progressively randomized surface magnetic moments. The calculations fit the data with a single adjustable parameter reflecting the extent of S or Ar+ induced fluctuations in the Ni surface exchange coupling.",

keywords = "Auger electron spectroscopy, Ising models, Magnetic surfaces, Ni alloys",

author = "M. Polak and J. Deng and L. Rubinovich",

year = "1996",

month = jun,

day = "20",

doi = "10.1016/0039-6028(96)00612-7",

language = "English",

volume = "357-358",

pages = "381--385",

journal = "Surface Science",

issn = "0039-6028",

publisher = "Elsevier",

}

TY - JOUR

T1 - Quenching of enhanced magnetic order at Ni-Al alloy surfaces by segregated sulfur and by Ar+ impact

AU - Polak, M.

AU - Deng, J.

AU - Rubinovich, L.

PY - 1996/6/20

Y1 - 1996/6/20

N2 - A comprehensive study of effects of adsorbate and structural disorder on surface enhanced Curie temperature of Ni-Al solid-solutions is reported. A recently developed procedure for monitoring magnetic transitions by means of attenuations induced in the low-energy Auger electrons spectrum has been used. Sulfur segregation and argon bombardment were found to reduce the surface related Curie temperature in a similar, significant manner. Its particular dependence on coverage or ion dose is discussed in the framework of the Kirkwood correlational approximation which has been adapted for semi-infinite, spin-1/2 Ising ferromagnet with enhanced, but progressively randomized surface magnetic moments. The calculations fit the data with a single adjustable parameter reflecting the extent of S or Ar+ induced fluctuations in the Ni surface exchange coupling.

AB - A comprehensive study of effects of adsorbate and structural disorder on surface enhanced Curie temperature of Ni-Al solid-solutions is reported. A recently developed procedure for monitoring magnetic transitions by means of attenuations induced in the low-energy Auger electrons spectrum has been used. Sulfur segregation and argon bombardment were found to reduce the surface related Curie temperature in a similar, significant manner. Its particular dependence on coverage or ion dose is discussed in the framework of the Kirkwood correlational approximation which has been adapted for semi-infinite, spin-1/2 Ising ferromagnet with enhanced, but progressively randomized surface magnetic moments. The calculations fit the data with a single adjustable parameter reflecting the extent of S or Ar+ induced fluctuations in the Ni surface exchange coupling.

KW - Auger electron spectroscopy

KW - Ising models

KW - Magnetic surfaces

KW - Ni alloys

UR - http://www.scopus.com/inward/record.url?scp=0030168106&partnerID=8YFLogxK

U2 - 10.1016/0039-6028(96)00612-7

DO - 10.1016/0039-6028(96)00612-7

M3 - Article

AN - SCOPUS:0030168106

SN - 0039-6028

VL - 357-358

SP - 381

EP - 385

JO - Surface Science

JF - Surface Science

ER -