scholarly journals Observation of Exchange Bias in Antiferromagnetic Cr0.79Se Due to the Coexistence of Itinerant Weak Ferromagnetism at Low Temperatures

ACS Omega ◽  
2021 ◽  
Author(s):  
Sayan Routh ◽  
Setti Thirupathaiah
Keyword(s):  
Exchange Bias ◽  
Low Temperatures ◽  
Weak Ferromagnetism

scholarly journals Exchange Bias in a Layered Metal–Organic Topological Spin Glass

2020 ◽  
Author(s):  
Ryan Murphy ◽  
Lucy Darago ◽  
Michael Ziebel ◽  
Elizabeth A. Peterson ◽  
Edmond W. Zaia ◽  
...  
Keyword(s):  
Spin Glass ◽  
Exchange Bias ◽  
Low Temperatures ◽  
2D Materials ◽  
Magnetic Behavior ◽  
Spin Frustration ◽  
Geometrically Frustrated ◽  
Spin Freezing ◽  
Metal Organic ◽  
Phase Chemistry

<p><b>The discovery of conductive and magnetic two-dimensional (2D) materials is critical for the development of next generation spintronics devices. Coordination chemistry in particular represents a highly versatile, though underutilized, route toward the synthesis of such materials with designer lattices. Here, we report the synthesis of a conductive, layered 2D metal–organic kagome lattice, Mn<sub>3</sub>(C<sub>6</sub>S<sub>6</sub>), using mild solution-phase chemistry. Strong geometric<i> </i>spin frustration in this system mediates spin freezing at low temperatures, which results in glassy magnetic behavior consistent with a geometrically frustrated (topological) spin glass. Notably, the material exhibits a large exchange bias of 1625 Oe, providing the first example of exchange bias in a coordination solid or a topological spin glass. More generally, these results demonstrate the potential utility of geometrically frustrated lattices in the design of new nanoscale spintronic materials.</b></p>

Exchange Bias in Co/FeMn and Co/IrMn Structures Induced by Deposition in Presence of Magnetic Field

2012 ◽  
Vol 190 ◽  
pp. 93-96
Author(s):  
I.O. Dzhun ◽  
N.G. Chechenin ◽  
S.A. Dushenko ◽  
E.A. Konstantinova
Keyword(s):  
Magnetic Field ◽  
Angular Dependence ◽  
Exchange Bias ◽  
Low Temperatures ◽  
Resonance Field ◽  
Blocking Temperature ◽  
Bilayer Structure ◽  
Magnetron Deposition ◽  
Unidirectional Anisotropy ◽  
Antiferromagnetic Layer

By measuring the angular dependence of ferromagnetic resonance field at room and low temperatures, it is demonstrated that the magnitude of magnetic field applied during magnetron deposition of Ta/F/AF/Ta structures, where F=Co, NiFe and AF=FeMn and IrMn, influences the uniaxial and unidirectional anisotropy, magnetization and the exchange bias blocking temperature. The deposition field effects on the bilayer structure are compared with the effects on a similar structure, but without antiferromagnetic layer. The exchange bias blocking temperature of investigated structures is found to be significantly lower than the Néel temperature of a bulk antiferromagnet. The origin of the observed effects is shortly discussed.

Weak ferromagnetism and exchange bias effect in Co1+yAl2-yO4/SiO2 nanocomposites

2021 ◽  
Vol 853 ◽  
pp. 155933
Author(s):  
Branka Babić-Stojić ◽  
Dušan Branković ◽  
Dušan Milivojević ◽  
Zvonko Jagličić
Keyword(s):  
Exchange Bias ◽  
Weak Ferromagnetism ◽  
Bias Effect ◽  
Exchange Bias Effect ◽  
Sio2 Nanocomposites

Annealing Influence on the Exchange-Bias and Magnetostructural Properties in the Ni50.0Mn36.5Sn13.5 Ribbon-Shape Alloy

2015 ◽  
Vol 233-234 ◽  
pp. 179-182 ◽  
Author(s):  
L. González-Legarreta ◽  
M. Ipatov ◽  
D. González-Alonso ◽  
Alexander P. Kamantsev ◽  
Victor V. Koledov ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Martensitic Transformation ◽  
Exchange Bias ◽  
Low Temperatures ◽  
Annealing Temperature ◽  
Magnetic Measurements ◽  
Hysteresis Loops ◽  
Bias Effect ◽  
Exchange Bias Effect ◽  
Short Annealing

We report on the influence of short annealing treatments at 923 K and 1073 K during 10min on both martensitic transformation and exchange bias effect for the Ni50.0Mn36.5Sn13.5Heusler alloy ribbon by means of magnetic measurements. We have observed that the martensitic transformation is shifted towards higher temperatures with increasing annealing temperature. Furthermore, isothermalM(H)hysteresis loops performed under field-cooling protocol show an exchange bias effect for as-quenched and two annealed ribbons, which indicates the existence of ferromagnetic-antiferromagnetic interactions at low temperatures. In particular, we observe thatHCdiminishes with the increasing of the annealing temperature, butHEis not affected by the heat treatment.

Peculiarities of Magnetic Properties of Ni-Ge Layered Films

2010 ◽  
Vol 168-169 ◽  
pp. 261-264 ◽  
Author(s):  
A.V. Chernichenko ◽  
I.S. Edelman ◽  
D.A. Velikanov ◽  
D.A. Marushchenko ◽  
Y.E. Greben’kova ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Surface Morphology ◽  
Exchange Bias ◽  
Low Temperatures ◽  
Mutual Diffusion ◽  
Average Radius ◽  
Antiferromagnetic Phase ◽  
Bias Effect ◽  
Exchange Bias Effect ◽  
Temperature Dependences

The surface morphology and magnetic properties of layered Ni-Ge films were investigated. The films surface has been shown to consist of the grains of 2 - 4 nm in height with the average radius of about 40-80 nm. Magnetization temperature dependences are different for FC and ZFC processes; in the latter case, the magnetization maximum is observed near the temperature Tm~50K. The exchange bias effect is observed at low temperatures. The results are explained by the formation of the antiferromagnetic phase in the interface between Ni and Ge layers due to the Ge and Ni mutual diffusion.

Weak Ferromagnetism and Exchange Bias in Antiferromagnetic Cobalt Oxide Nanoparticles

2018 ◽  
Vol 23 (4) ◽  
pp. 487-490 ◽  
Author(s):  
X. L. Wang ◽  
H. L. Ge ◽  
Q. L. Ye ◽  
P. Z. Si ◽  
H. J. Chen
Keyword(s):  
Cobalt Oxide ◽  
Exchange Bias ◽  
Weak Ferromagnetism ◽  
Oxide Nanoparticles ◽  
Cobalt Oxide Nanoparticles

scholarly journals Exchange Bias in a Layered Metal–Organic Topological Spin Glass

2020 ◽  
Author(s):  
Ryan Murphy ◽  
Lucy Darago ◽  
Michael Ziebel ◽  
Elizabeth A. Peterson ◽  
Edmond W. Zaia ◽  
...  
Keyword(s):  
Spin Glass ◽  
Exchange Bias ◽  
Low Temperatures ◽  
2D Materials ◽  
Magnetic Behavior ◽  
Spin Frustration ◽  
Geometrically Frustrated ◽  
Spin Freezing ◽  
Metal Organic ◽  
Phase Chemistry

<p><b>The discovery of conductive and magnetic two-dimensional (2D) materials is critical for the development of next generation spintronics devices. Coordination chemistry in particular represents a highly versatile, though underutilized, route toward the synthesis of such materials with designer lattices. Here, we report the synthesis of a conductive, layered 2D metal–organic kagome lattice, Mn<sub>3</sub>(C<sub>6</sub>S<sub>6</sub>), using mild solution-phase chemistry. Strong geometric<i> </i>spin frustration in this system mediates spin freezing at low temperatures, which results in glassy magnetic behavior consistent with a geometrically frustrated (topological) spin glass. Notably, the material exhibits a large exchange bias of 1625 Oe, providing the first example of exchange bias in a coordination solid or a topological spin glass. More generally, these results demonstrate the potential utility of geometrically frustrated lattices in the design of new nanoscale spintronic materials.</b></p>

Factors Affecting Exchange Bias in Polycrystalline Metallic Thin Films

2007 ◽  
Vol 1032 ◽  
Author(s):  
Luis Eugenio Fernandez-Outon ◽  
Gonzalo Vallejo-Fernandez ◽  
Kevin O'Grady
Keyword(s):  
Thin Films ◽  
Exchange Bias ◽  
Low Temperatures ◽  
Energy Barrier ◽  
Experimental Measurements ◽  
Volume Distribution ◽  
Metallic Thin Films ◽  
Factors Affecting ◽  
Field Annealing ◽  
Small Grains

AbstractWe describe the factors which control the measured value of exchange bias (HEX) in bilayers consisting of sputtered metallic thin films of an antiferromagnet (AF) in contact with a ferromagnetic (F) layer. Experimental measurements show that the value of HEX is determined by the grain volume distribution which limits the exchange bias via small grains which are thermally unstable, and large grains which cannot be set when the system is field annealed to set the AF at temperatures below TN. All the results are interpreted in terms of a granular model where the energy barrier to reversal within the AF is grain volume dependent. We show how this affects setting in metallic AFs at T<TN. We have also found that exchange bias is moderated by disordered spins at the F/AF interface. These spins can be ordered at low temperatures and by field annealing. Ordering of interfacial spins leads to an increase in HEX of up to 30%.

Hexafluoro antimonates(V) of divalent metals, synthesis and properties

1989 ◽  
Vol 67 (11) ◽  
pp. 1700-1707 ◽  
Author(s):  
M. S. R. Cader ◽  
F. Aubke
Keyword(s):  
Magnetic Susceptibility ◽  
Low Temperature ◽  
Ground State ◽  
Low Temperatures ◽  
Weak Ferromagnetism ◽  
Ligand Field ◽  
Antiferromagnetic Exchange ◽  
Divalent Metals ◽  
Mixed Valency ◽  
Efficient Route

Solvolysis of metal(II) fluorosulfates in liquid antimony(V) fluoride according to:[Formula: see text]with M = Sn, Ni, Pd, Cu, or Ag, is found to be a clean, efficient route to the hexafluoro antimonates of the corresponding metals. Two of the compounds reported here display unusual features: Pd(SbF6)2 is, like its fluorosulfate precursor, paramagnetic with the Pd2+ ion in a 3A2g ground state, and an analysis of the ligand field spectrum is presented; Ag(SbF6)2 is, unlike a recently reported paramagnetic, blue, valence isomer, diamagnetic and nearly white in color. Formulation as a mixed valency compound Ag(I)Ag(III)(SbF6)4 is suggested. Low temperature magnetic susceptibility measurements (where appropriate), Raman, and IR data are reported. The hexafluoro antimonates of Ni, Pd, and Cu show antiferromagnetic exchange at very low temperatures. Pd(SbF6)2 shows very weak ferromagnetism below 10 K. Keywords: fluoroantimonates of divalent metals, synthesis and solvolysis in SbF5, vibrational spectra, magnetic susceptibility measurements.

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