Room-temperature coercivity enhancement in mechanically alloyed antiferromagnetic-ferromagnetic powders

Sort, Jordi; Nogués, J.; Amils, X.; Suriñach, S.; Muñoz, J.S.; Baró, Maria Dolores

doi:10.1063/1.125269

Cited by 107 publications

(76 citation statements)

References 22 publications

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“…However, in most of the cases theories were limited to specific problems where intricate structures at the interfaces were simplified. Until now, EB effects have been exploited in several technological applications such as read head of recording devices [39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54], magnetoresistive random access memories (MRRAM) [55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76] and it has been proposed for the technological applications in stabilizing magnetization of superparamagnetic nanoparticles [77,78,79,80] or to improve coercivity and energy product of the permanent magnets [81,82,83,84].…”

Section: Introductionmentioning

confidence: 99%

Exchange bias effect in alloys and compounds

Giri

Patra

Majumdar

2011

J. Phys.: Condens. Matter

320

225

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Abstract. The phenomenology of exchange bias effects observed in structurally single-phase alloys and compounds but composed of a variety of coexisting magnetic phases such as ferromagnetic, antiferromagnetic, ferrimagnetic, spin-glass, clusterglass, disordered magnetic states are reviewed. The investigations on exchange bias effects are discussed in diverse types of alloys and compounds where qualitative and quantitative aspects of magnetism are focused based on macroscopic experimental tools such as magnetization and magnetoresistance measurements. Here, we focus on improvement of fundamental issues of the exchange bias effects rather than on their technological importance.

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Section: Introductionmentioning

confidence: 99%

Exchange bias effect in alloys and compounds

Giri

Patra

Majumdar

2011

J. Phys.: Condens. Matter

320

225

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“…Though various efforts were made earlier to enhance the blocking temperature using exchange bias [20,21], the present work deals with the lower particle sizes of a few…”

Section: From the Fc And Zfc Magnetization (M) Vs Temperature(t) Curvmentioning

confidence: 99%

Exchange bias in Co-Cr2O3 nanocomposites

Kumar¹,

Mandal²

2007

Journal of Applied Physics

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The possibility of using exchange bias in ferromagnetic-antiferromagnetic system to over come the effect of superparamagnetism in small cobalt nanoparticles is explored. We have prepared Co-Cr 2 O 3 nanocomposite powders using a chemical method. It is shown that in this system the effect of superparamagnetism in cobalt nanoparticles could be overcome.The superparamagnetic blocking temperature of 3 nm cobalt particles has been increased to above room temperature. The choice of Cr 2 O 3 is vital as its T N is higher compared to other antiferromagnetic materials used for this purpose such as CoO. The field cooled and zero field cooled hysteresis measurements of the samples confirm the existence of exchange bias interaction in this system. PACS

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“…While they achieve a high interface/volume ratio, core-shell nanoparticles and thin film architectures do not result in large quantities of exchange-biased material. As an alternative, novel methods of processing exchange biased systems have been explored, including coevaporation, 8 mechanical milling, 9 and spontaneous phase separation. 14 have demonstrated that remarkable microstructures with aligned porosity can be observed when the reduction product shares a common oxygen sublattice with the precursor.…”

Section: Introductionmentioning

confidence: 99%

Exchange biasing of single-domain Ni nanoparticles spontaneously grown in an antiferromagnetic MnO matrix

Shoemaker¹,

Grossman²,

Seshadri³

2008

J. Phys.: Condens. Matter

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Exchange biased composites of ferromagnetic single-domain Ni nanoparticles embedded within large grains of MnO have been prepared by reduction of NixMn1−xO4 phases in flowing hydrogen. The Ni precipitates are 15-30 nm in extent, and the majority are completely encased within the MnO matrix. The manner in which the Ni nanoparticles are spontaneously formed imparts a high ferromagnetic-antiferromagnetic interface/volume ratio, which results in substantial exchange bias effects. Exchange bias fields of up to 100 Oe are observed, in cases where the starting Ni content x in the precursor NixMn1−xO4 phase is small. For particles of approximately the same size, the exchange bias leads to significant hardening of the magnetization, with the coercive field scaling nearly linearly with the exchange bias field.

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Room-temperature coercivity enhancement in mechanically alloyed antiferromagnetic-ferromagnetic powders

Cited by 107 publications

References 22 publications

Exchange bias effect in alloys and compounds

Exchange bias effect in alloys and compounds

Exchange bias in Co-Cr2O3 nanocomposites

Exchange biasing of single-domain Ni nanoparticles spontaneously grown in an antiferromagnetic MnO matrix

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