197Au MÖssbauer Study of Au/Fe, Au/Co and Au/Ni Magnetic Multilayers

1995 ◽  
Vol 384 ◽  
Author(s):  
Saburo Nasu ◽  
Yasuhiro Kobayashi
Keyword(s):  
Hyperfine Field ◽  
Magnetic Hyperfine Field ◽  
Ferromagnetic Layer ◽  
Magnetic Multilayers ◽  
Electron Spin Polarization ◽  
Hyperfine Fields ◽  
Mössbauer Study ◽  
Mössbauer Measurements ◽  
Local Environments ◽  
Ferromagnetic Layers

ABSTRACT197Au Mössbauer measurements have been performed for Au/Fe, Au/Co and Au/Ni magnetic multilayers. 197Au Mössbauer spectra observed from multilayers consist of at least 4 components having different magnitude of hyperfine fields and isomer shift values those depend on the local environments of the Au probe-atoms in multilayers. Rather large electron spin polarization at Au atoms has been observed in the interface with adjacent ferromagnetic layers, but nearly no magnetic hyperfine field has been observed to the interior of Au layer. It implies that the largest hyperfine field observed is not due to the conduction-electron polarization but induced by the hybridization in the interface with ferromagnetic layer.

Magnetic hyperfine field splitting in the Zintl phase Eu2Mg4Si3

2019 ◽  
Vol 74 (5) ◽  
pp. 451-454 ◽  
Author(s):  
Theresa Block ◽  
Ryosuke Numakura ◽  
Masashi Kosaka ◽  
Shinji Michimura ◽  
Rainer Pöttgen
Keyword(s):  
Mössbauer Spectroscopy ◽  
Hyperfine Field ◽  
Mossbauer Spectroscopy ◽  
Magnetic Hyperfine Field ◽  
Type Structure ◽  
Magnetic Hyperfine ◽  
Hyperfine Fields ◽  
Zintl Phase ◽  
Field Splitting ◽  
Divalent State

AbstractEu2Mg4Si3 ≡ (2Eu2+)(4Mg2+)(3Si4−) is an electron-precise Zintl phase. Its Hf2Co4P3-type structure contains three crystallographically independent europium sites. The divalent state of europium was manifested through 151Eu Mössbauer spectroscopy. In the paramagnetic regime (T = 78 K) the isomer shifts range from −9.16 to −11.29 mm s−1. Eu2Mg4Si3 shows complex magnetic hyperfine field splitting at T = 5.7 K with a superposition of three subspectra with magnetic hyperfine fields of 5.4 (Eu2), 20.4 (Eu1) and 22.4 (Eu3) T.

A Mössbauer Study of the Amorphous System (FexNi1−x)75P16B6Al3

1980 ◽  
Vol 3 ◽  
Author(s):  
S. Bjarman ◽  
R. Wäppling ◽  
K.V. Rao
Keyword(s):  
Low Temperature ◽  
Hyperfine Field ◽  
Composition Range ◽  
Magnetic Hyperfine Field ◽  
Magnetic Behaviour ◽  
Mössbauer Study ◽  
Hyperfine Field Distribution ◽  
Amorphous System ◽  
Spin Texture ◽  
Curie Temperatures

ABSTRACTIn the system (FeXNi1−x)75P16B6Al3 an unusual magnetic behaviour is found in the composition range 0.2<x<0.3. The drastic changes seen at low temperature in the thermomagnetic measurements is found not to affect the Mössbauer spectra. From the width of the magnetic hyperfine field distribution as function of temperature there seems to be a distribution in Curie temperatures. Due to the absence of spin texture it was not possible to make a distinction between the two proposed low temperature phases although the general results favour the spin glass alternative.

scholarly journals Nuclear Gamma Resonance Study of the Ir —Fe and Ir —Ni Alloy Systems

1971 ◽  
Vol 26 (3) ◽  
pp. 343-352 ◽  
Author(s):  
R.L. Mössbauer ◽  
M. Lengsfeld ◽  
W. Von Lieres ◽  
W. Potzel ◽  
T. Teschner ◽  
...  
Keyword(s):  
Composition Range ◽  
Magnetic Hyperfine Field ◽  
Band Model ◽  
Hyperfine Fields ◽  
Ni Alloys ◽  
Dilute Alloys ◽  
Ni Alloy ◽  
Bulk Magnetization ◽  
Bcc Phase ◽  
Alloy Systems

Abstract The Ir-Fe and Ir-Ni alloy systems were studied over the whole composition range by means of the nuclear resonance absorption of the 73 keV y-rays of 193Jr and of the 14.4 keV y-rays of 57Fe. The magnetic hyperfine field at the Ir-nuclei in Ir-Ni alloys decreases approximately linearly with the Ir concentration from - 460 kOe at 4.2 K in very dilute alloys to zero at about 20 at.-% Ir. This behaviour is paralleled by the decrease of the magnetic moment per Ni atom as determined from bulk magnetization measurements. The hyperfine fields at both Ir and Fe were measured for the ferromagnetic bcc phase of the Ir-Fe system. They turned out to be virtually independent of concentration with values of about -1400 kOe and - 330 kOe, respectively. Linewidths increasing with the Ir concentration indicate a distribution of hyperfine fields. The fee phase of the Ir-Fe system has been found to be paramagnetic at 4.2 K throughout the range of its existence. The dependence of the hyperfine fields on concentration is discussed in terms of a rigid 3d-band model combined with local shielding. A discussion of the concentration dependence of the 193Ir and 57Fe isomer shifts has to take into account lattice expansion as well as band repopulation effects.

A 19F, 119Sn nuclear magnetic resonance and 119Sn Mössbauer study of the SnF2–MF–H2O system

1984 ◽  
Vol 62 (3) ◽  
pp. 591-595 ◽  
Author(s):  
Thomas Birchall ◽  
Georges Dénès
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Spectroscopic Data ◽  
Dominant Species ◽  
Mössbauer Study ◽  
Frozen Solution ◽  
Nmr Data ◽  
Mössbauer Measurements ◽  
Mössbauer Parameters ◽  
High Concentrations ◽  
Frozen Solutions

19F and 119Sn nmr spectroscopy has been used to study the SnF2–MF–H2O (M = Li+, Na+, K+, Rb+, Cs+, and [NH4]+) system. The nmr data have been supplemented by frozen solution 119Sn Mössbauer measurements. The evidence suggests that the dominant species in the SnF2–H2O system is a hydrated stannous fluoride, probably SnF2•H2O having Mössbauer parameters of δ = 3.46 mm s−1 and Δ = 1.70 mm s−1. When F− is added to these solutions rapid F− exchange occurs with the hydrated SnF2 and the dominant species becomes [SnF3]−. The 119Sn nmr chemical shift of [SnF3]− is ~ −700 ppm from (CH3)4Sn. The 119Sn Mössbauer parameters for frozen solutions of [SnF3]− are δ = ~ 3.1 mm s−1 Δ = 1.9 mm s−1. These spectroscopic data are cation dependent. We could find no strong evidence for high concentrations of [Sn2F5]− in any of these solutions.

Magnetic hyperfine field for zinc in nickel

1974 ◽  
Vol 267 (4) ◽  
pp. 299-304 ◽  
Author(s):  
H. Bertschat ◽  
H. Haas ◽  
F. Pleiter ◽  
E. Recknagel ◽  
E. Schlodder ◽  
...  
Keyword(s):  
Hyperfine Field ◽  
Magnetic Hyperfine Field ◽  
Magnetic Hyperfine
Sign in / Sign up

Export Citation Format

Share Document