scholarly journals First-order ferromagnetic transition in single-crystalline (Mn,Fe)2(P,Si)

2015 ◽  
Vol 107 (16) ◽  
pp. 162403 ◽  
Author(s):  
H. Yibole ◽  
F. Guillou ◽  
Y. K. Huang ◽  
G. R. Blake ◽  
A. J. E. Lefering ◽  
...  
Keyword(s):  
Ferromagnetic Transition ◽  
Single Crystalline ◽  
First Order

scholarly journals Magnetic relaxation dynamics driven by the first-order character of magnetocaloric La(Fe,Mn,Si) 13

2016 ◽  
Vol 374 (2074) ◽  
pp. 20150307 ◽  
Author(s):  
Edmund Lovell ◽  
Milan Bratko ◽  
A. David Caplin ◽  
Alexander Barcza ◽  
Matthias Katter ◽  
...  
Keyword(s):  
Temporal Dynamics ◽  
Magnetic Hysteresis ◽  
Relative Magnitude ◽  
Zero Field ◽  
Ferromagnetic Transition ◽  
Relaxation Dynamics ◽  
First Order ◽  
Temperature Separation ◽  
The Magnetic Field ◽  
Field Transition

Here, we study the temporal evolution of the magnetic field-driven paramagnetic to ferromagnetic transition in the La(Fe,Mn,Si) 13 material family. Three compositions are chosen that show varying strengths of the first-order character of the transition, as determined by the relative magnitude of their magnetic hysteresis and temperature separation between the zero-field transition temperature T c and the temperature T crit , where the transition becomes continuous. Systematic variations in the fixed field, isothermal rate of relaxation are observed as a function of temperature and as a function of the degree of first-order character. The relaxation rate is reduced in more weakly first-order compositions and is also reduced as the temperature is increased towards T crit . At temperatures above T crit , the metastability of the transition vanishes along with its associated temporal dynamics. This article is part of the themed issue ‘Taking the temperature of phase transitions in cool materials’.

STRUCTURAL AND MAGNETIC PHASE TRANSITIONS OF BiFeO3 INDUCED BY PRESSURE

2013 ◽  
Vol 06 (03) ◽  
pp. 1350026 ◽  
Author(s):  
HONG-JIAN FENG ◽  
XIAOYUN HU ◽  
HUIJUAN CHEN
Keyword(s):  
Phase Transitions ◽  
First Principles ◽  
Magnetic Phase ◽  
Structural Phase ◽  
Orthorhombic Phase ◽  
Magnetic Phase Transitions ◽  
Ferromagnetic Transition ◽  
First Principles Calculations ◽  
First Order ◽  
Pressure Region

First-principles calculations on BiFeO3 under low-pressure region show that the rhombohedral-monoclinic and rhombohedral-orthorhombic phase transitions can be found around the critical pressure value, ~9 GPa.We suggest that the structure involve the combination of these three phases and change to the pure orthorhombic phase gradually as pressure is beyond the critical value. Moreover, it is a first-order structural phase transition, accompanied with antiferromagnetic–ferromagnetic transition.

The Adiabatic Temperature Changes in the Vicinity of the First-Order Paramagnetic-Ferromagnetic Transition in the Ni-Mn-In-B Heusler Alloy

2012 ◽  
Vol 48 (11) ◽  
pp. 3738-3741 ◽  
Author(s):  
Igor Dubenko ◽  
Tapas Samanta ◽  
Abdiel Quetz ◽  
Alexander Kazakov ◽  
Igor Rodionov ◽  
...  
Keyword(s):  
Heusler Alloy ◽  
Adiabatic Temperature ◽  
Ferromagnetic Transition ◽  
Temperature Changes ◽  
First Order

scholarly journals Magnetocaloric Effect, Magnetoresistance of Sc0.28Ti0.72Fe2, and Phase Diagrams of Sc0.28Ti0.72Fe2−xTx Alloys with T = Mn or Co

Crystals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 410 ◽  
Author(s):  
Liting Sun ◽  
Hargen Yibole ◽  
Ojiyed Tegus ◽  
Francois Guillou
Keyword(s):  
Phase Diagrams ◽  
Negative Thermal Expansion ◽  
Ferromagnetic Transition ◽  
Unique Case ◽  
Laves Phases ◽  
Finite Moment ◽  
First Order ◽  
Magnetocaloric Materials ◽  
Negative Thermal Expansion Materials ◽  
Curie Temperature Tc

(Sc,Ti)Fe2 Laves phases present a relatively unique case of first-order ferro-ferromagnetic transition originating from an instability of the Fe moment. In addition to large magnetoelastic effects making them potential negative thermal expansion materials, here, we show that Sc0.28Ti0.72Fe2 and related alloys also present sizable magnetocaloric and magnetoresistance effects. Both effects are found substantially larger at the ferro-ferromagnetic transition (Tt1) than near the Curie temperature TC, yet they remain limited in comparison to other classes of giant magnetocaloric materials. We suggest a strategy to improve these properties by bringing the transition at Tt1 close to TC, and test its possible realization by Co or Mn for Fe substitutions. The structural and magnetic phase diagrams of Sc0.28Ti0.72Fe2−xTx alloys with T = Mn or Co are explored. Substitutions for Fe by adjacent Mn or Co elements give rise to a breakdown of the long-range ferromagnetic order, as well as a swift disappearance of finite moment magnetism.

Nature of the first-order antiferromagnetic-ferromagnetic transition in the Ge-rich magnetocaloric compoundsGd5(SixGe1−x)4

2000 ◽  
Vol 62 (2) ◽  
pp. 1022-1026 ◽  
Author(s):  
L. Morellon ◽  
J. Blasco ◽  
P. A. Algarabel ◽  
M. R. Ibarra
Keyword(s):  
Ferromagnetic Transition ◽  
First Order

First-Order Ferromagnetic Transition of Quantum Spin Ice System Yb2Ti2O7

SPIN ◽  
2015 ◽  
Vol 05 (02) ◽  
pp. 1540002 ◽  
Author(s):  
Yukio Yasui ◽  
Noriaki Hamachi ◽  
Yohei Kono ◽  
Shunichiro Kittaka ◽  
Toshiro Sakakibara
Keyword(s):  
Neutron Diffraction ◽  
Specific Heat ◽  
Single Crystals ◽  
Thermal Hysteresis ◽  
Hysteresis Loops ◽  
Quantum Spin ◽  
Ferromagnetic Transition ◽  
Spin Ice ◽  
First Order ◽  
Quantum Spin Ice

The neutron diffraction and measurements of specific heat and magnetization were carried out on single crystals of a quantum spin ice system Yb 2 Ti 2 O 7. The thermal hysteresis loops of temperature dependence of the magnetization and neutron diffraction intensity indicate a first-order ferromagnetic transition, where the used single crystals are confirmed to have a sharp peak structure in the specific heat (C)–temperature (T) curve at T C ∼ 0.2 K. The magnetic structure analysis of neutron diffraction results revealed that the Yb 3+ moments have a ferromagnetic collinear structure along [001] directions with ordered moment value 1.1 ± 0.1 μB at 0.03 K. The mechanism of ferromagnetic transition of Yb 2 Ti 2 O 7 will be discussed.

Weakly first-order behavior in ferromagnetic transition of UCoGe revealed by 59Co-NQR studies

2010 ◽  
Vol 470 ◽  
pp. S561-S563 ◽  
Author(s):  
T. Hattori ◽  
K. Ishida ◽  
Y. Nakai ◽  
T. Ohta ◽  
K. Deguchi ◽  
...  
Keyword(s):  
Ferromagnetic Transition ◽  
First Order
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