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Structure and magnetism of antiferro...

Maat, Stefan.

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Structure and magnetism of antiferromagnetic FeMN thin films.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Structure and magnetism of antiferromagnetic FeMN thin films./
Author:	Maat, Stefan.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2000,
Description:	237 p.
Notes:	Source: Dissertations Abstracts International, Volume: 62-02, Section: B.
Contained By:	Dissertations Abstracts International62-02B.
Subject:	Condensation. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9966702
ISBN:	9780599710252

Structure and magnetism of antiferromagnetic FeMN thin films.
Maat, Stefan.

Structure and magnetism of antiferromagnetic FeMN thin films. - Ann Arbor : ProQuest Dissertations & Theses, 2000 - 237 p.

Source: Dissertations Abstracts International, Volume: 62-02, Section: B.

Thesis (Ph.D.)--The University of Alabama, 2000.

The magnetic and electronic structure of bulk fcc Fe 50Mn50 was studied by first principles calculations using the layer-version of the Korringa-Kohn-Rostocker method with the local spin density approximation and the coherent potential approximation to treat chemical disorder. The self-consistent calculations suggest a non-collinear spin-structure for Fe50Mn50 as the magnetic ground state, which can be understood from the electronic structure. Possible spin-structures identified are the 3Q structure with spins pointing along the body diagonals and the 2Q structure with spins pointing along the face diagonals. The collinear 1Q structure with spins pointing along the cube edges was found to be energetically unstable. Epitaxial FeMn/Cu multilayers were grown epitaxially by sputtering onto a thick buffer layer of twinned Cu(111) on H-terminated Si(110). The growth was characterized in situ by Auger electron spectroscopy and electron diffraction techniques and ex situ by X-ray diffraction. Neutron diffraction experiments were performed on these multilayers to investigate the spin structure of thin Fe50Mn50 films. The measurements confirmed that Fe50Mn50 has either a 3Q structure or equally populated domains of 2Q or 1Q structures. Hysteresis loops of polycrystalline and epitaxial exchange-biased Ni 80Fe20/Fe50Mn50 films were measured as a function of Fe50Mn50 layer thickness with the longitudinal Kerr effect. The variation of the loop-shift and the coercivity were observed over a full 360° in plane rotation and Fourier analyzed. Coercivities and loop shifts show a strong dependence on the antiferromagnetic layer thickness. Examination of the angular dependent results within different models of exchange bias verified that the Fourier coefficients obey necessary conditions to achieve energetic stability together with spontaneous magnetization.

ISBN: 9780599710252Subjects--Topical Terms:

942542
Condensation.
Subjects--Index Terms:

Antiferromagnetic

Structure and magnetism of antiferromagnetic FeMN thin films.
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100 1 $a Maat, Stefan. $3 3769042
245 1 0 $a Structure and magnetism of antiferromagnetic FeMN thin films.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2000
300 $a 237 p.
500 $a Source: Dissertations Abstracts International, Volume: 62-02, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Mankey, Gary J.
502 $a Thesis (Ph.D.)--The University of Alabama, 2000.
520 $a The magnetic and electronic structure of bulk fcc Fe 50Mn50 was studied by first principles calculations using the layer-version of the Korringa-Kohn-Rostocker method with the local spin density approximation and the coherent potential approximation to treat chemical disorder. The self-consistent calculations suggest a non-collinear spin-structure for Fe50Mn50 as the magnetic ground state, which can be understood from the electronic structure. Possible spin-structures identified are the 3Q structure with spins pointing along the body diagonals and the 2Q structure with spins pointing along the face diagonals. The collinear 1Q structure with spins pointing along the cube edges was found to be energetically unstable. Epitaxial FeMn/Cu multilayers were grown epitaxially by sputtering onto a thick buffer layer of twinned Cu(111) on H-terminated Si(110). The growth was characterized in situ by Auger electron spectroscopy and electron diffraction techniques and ex situ by X-ray diffraction. Neutron diffraction experiments were performed on these multilayers to investigate the spin structure of thin Fe50Mn50 films. The measurements confirmed that Fe50Mn50 has either a 3Q structure or equally populated domains of 2Q or 1Q structures. Hysteresis loops of polycrystalline and epitaxial exchange-biased Ni 80Fe20/Fe50Mn50 films were measured as a function of Fe50Mn50 layer thickness with the longitudinal Kerr effect. The variation of the loop-shift and the coercivity were observed over a full 360° in plane rotation and Fourier analyzed. Coercivities and loop shifts show a strong dependence on the antiferromagnetic layer thickness. Examination of the angular dependent results within different models of exchange bias verified that the Fourier coefficients obey necessary conditions to achieve energetic stability together with spontaneous magnetization.
590 $a School code: 0004.
650 4 $a Condensation. $3 942542
650 4 $a Electrical engineering. $3 649834
650 4 $a Electromagnetism. $3 522050
650 4 $a Electromagnetics. $3 3173223
650 4 $a Condensed matter physics. $3 3173567
653 $a Antiferromagnetic
653 $a Iron manganese
653 $a Thin films
690 $a 0611
690 $a 0544
690 $a 0607
710 2 $a The University of Alabama. $3 1019361
773 0 $t Dissertations Abstracts International $g 62-02B.
790 $a 0004
791 $a Ph.D.
792 $a 2000
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9966702