Journal ArticleDOI
Criterion for Ferromagnetism from Observations of Magnetic Isotherms
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TLDR
In this article, a criterion for determining the onset of ferromagnetism in a material as its temperature is lowered from a region in which the linearity of its magnetic moment versus field isotherm gives an indication of paramagnetisms.Abstract:
A criterion is proposed for determining the onset of ferromagnetism in a material as its temperature is lowered from a region in which the linearity of its magnetic moment versus field isotherm gives an indication of paramagnetism. Within the limits of validity of a molecular field treatment, the Curie temperature is shown to be in general indicated by the third power of the magnetization being proportional to the internal magnetic field. The method has been employed to redetermine the Curie point of nickel from the data of Weiss and Forrer, of ${\mathrm{Fe}}_{3}$${\mathrm{O}}_{4}$ from the data of Smith and of some alloys from the data of Kaufmann and his collaborators and the author.read more
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Journal ArticleDOI
Electric-field control of ferromagnetism
Hideo Ohno,Daichi Chiba,Fumihiro Matsukura,T. Omiya,E. Abe,Tomasz Dietl,Tomasz Dietl,Yuzo Ohno,Keita Ohtani +8 more
TL;DR: By applying electric fields, the ability to externally control the properties of magnetic materials would be highly desirable from fundamental and technological viewpoints is demonstrated, particularly in view of recent developments in magnetoelectronics and spintronics.
Journal ArticleDOI
Gate-tunable room-temperature ferromagnetism in two-dimensional Fe 3 GeTe 2 .
Yujun Deng,Yujun Deng,Yijun Yu,Yijun Yu,Yichen Song,Yichen Song,Jingzhao Zhang,Naizhou Wang,Naizhou Wang,Zeyuan Sun,Zeyuan Sun,Yangfan Yi,Yangfan Yi,Yizheng Wu,Yizheng Wu,Shiwei Wu,Shiwei Wu,Junyi Zhu,Jing Wang,Jing Wang,Xianhui Chen,Xianhui Chen,Yuanbo Zhang,Yuanbo Zhang +23 more
TL;DR: It is found that the itinerant ferromagnetism persists in Fe3GeTe2 down to the monolayer with an out-of-plane magnetocrystalline anisotropy, which opens up opportunities for potential voltage-controlled magnetoelectronics based on atomically thin van der Waals crystals.
Journal Article
Gate-tunable Room-temperature Ferromagnetism in Two-dimensional Fe 3 GeTe 2
Yujun Deng,Yijun Yu,Yichen Song,Jingzhao Zhang,Naizhou Wang,Zeyuan Sun,Yangfan Yi,Yizheng Wu,Shiwei Wu,Junyi Zhu,Jing Wang,Xianhui Chen,Yuanbo Zhang +12 more
TL;DR: In this paper, it was shown that the itinerant ferromagnetic order persists in Fe3GeTe2 down to the monolayer with an out-of-plane magnetocrystalline anisotropy.
Journal ArticleDOI
Detailed Magnetic Behavior of Nickel Near its Curie Point
J. S. Kouvel,Michael E. Fisher +1 more
TL;DR: In this article, the authors derived the temperature dependence of the initial susceptibility of nickel above the Curie point and the field dependence of its magnetization at the same point from the data of Weiss and Forrer and found that the results were at variance with the simple molecular field model.
Journal ArticleDOI
Mesoscopic fast ion conduction in nanometre-scale planar heterostructures
TL;DR: The preparation of defined heterolayered films composed of CaF2 and BaF2 that exhibit ionic conductivity increasing proportionally with interface density are reported, in excellent agreement with semi-infinite space-charge calculations, assuming a redistribution of fluoride ions at the interfaces.