Magnetic and transport characteristics on high Curie temperature ferromagnet of Mn-doped GaN

Sasaki, T.; Sonoda, Saki; Yamamoto, Yoshiyuki; Suga, Kazuyoshi; Shimizu, Saburo; Kindo, K.; Hori, Hidenobu

doi:10.1063/1.1451879

Cited by 208 publications

(142 citation statements)

References 12 publications

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“…This variation of resistivity, similar to that of (Ga,Mn)N (ref. 14), is often observed in heavily doped semiconductors. Strictly metallic behaviour (with monotonic decrease of resistivity with decreasing temperatures) is not a precondition of having a ferromagnetic coupling between Mn moments mediated by RKKY interaction, as discussed in refs 1 and 15.…”

Section: Resultsmentioning

confidence: 99%

New diluted ferromagnetic semiconductor with Curie temperature up to 180 K and isostructural to the ‘122’ iron-based superconductors

et al. 2013

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Diluted magnetic semiconductors have received much attention due to their potential applications for spintronics devices. A prototypical system (Ga,Mn)As has been widely studied since the 1990s. The simultaneous spin and charge doping via hetero-valent (Ga 3 þ ,Mn 2 þ ) substitution, however, resulted in severely limited solubility without availability of bulk specimens. Here we report the synthesis of a new diluted magnetic semiconductor (Ba 1 À x K x )(Zn 1 À y Mn y ) 2 As 2 , which is isostructural to the 122 iron-based superconductors with the tetragonal ThCr 2 Si 2 (122) structure. Holes are doped via (Ba 2 þ , K 1 þ ) replacements, while spins via isovalent (Zn 2 þ ,Mn 2 þ ) substitutions. Bulk samples with x ¼ 0.1 À 0.3 and y ¼ 0.05 À 0.15 exhibit ferromagnetic order with T C up to 180 K, which is comparable to the highest T C for (Ga,Mn)As and significantly enhanced from T C up to 50 K of the '111'-based Li(Zn,Mn)As. Moreover, ferromagnetic (Ba,K)(Zn,Mn) 2 As 2 shares the same 122 crystal structure with semiconducting BaZn 2 As 2 , antiferromagnetic BaMn 2 As 2 and superconducting (Ba,K)Fe 2 As 2 , which makes them promising for the development of multilayer functional devices.

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Section: Resultsmentioning

confidence: 99%

New diluted ferromagnetic semiconductor with Curie temperature up to 180 K and isostructural to the ‘122’ iron-based superconductors

et al. 2013

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“…[22][23][24][25][26][27] Spin-GGA calculations of electronic structures and magnetic properties of materials which consist of atoms having only s and p electrons are thought to be the most reliable and give satisfactory results.…”

Section: Introductionmentioning

confidence: 99%

Synthetic ferromagnetic nitrides: First-principles calculations of CaN and SrN

et al. 2007

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Encouraged by recent experimental facts of synthesizing materials which do not exist in nature, we introduce a type of ferromagnets, CaN and SrN, which have been proposed by first-principles calculations. These are half-metallic ferromagnets and they have magnetic moments of 1 B per chemical formula unit. Out of typical structures of binary compounds we have calculated, the rocksalt structure is the most stable form for both CaN and SrN. The majority of the magnetic moment of these compounds originates from the nitrogen sites since the p states of nitrogen are spin polarized. The mechanism of the ferromagnetism is discussed. Their formation energies have been calculated and the results show that it should be feasible to synthesize these materials. The structural stability of CaN has been confirmed by performing first-principles molecular dynamics simulations. We propose a synthesis process for CaN using the high pressure and temperature environment.

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“…[16][17][18] At this point, however, it is unclear that the ferromagnetism is mediated by a dilute carrier system and therefore electrically tunable.…”

Section: Future Prospects and Outstanding Issuesmentioning

confidence: 99%

Ferromagnetic semiconductors: moving beyond (Ga,Mn)As

2005

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The recent development of MBE techniques for growth of III-V ferromagnetic semiconductors has created materials with exceptional promise in spintronics, i.e. electronics that exploit carrier spin polarization. Among the most carefully studied of these materials is (Ga,Mn)As, in which meticulous optimization of growth techniques has led to reproducible materials properties and ferromagnetic transition temperatures well above 150 K. We review progress in the understanding of this particular material and efforts to address ferromagnetic semiconductors as a class. We then discuss proposals for how these materials might find applications in spintronics. Finally, we propose criteria that can be used to judge the potential utility of newly discovered ferromagnetic semiconductors, and we suggest guidelines that may be helpful in shaping the search for the ideal material.

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Magnetic and transport characteristics on high Curie temperature ferromagnet of Mn-doped GaN

Cited by 208 publications

References 12 publications

New diluted ferromagnetic semiconductor with Curie temperature up to 180 K and isostructural to the ‘122’ iron-based superconductors

New diluted ferromagnetic semiconductor with Curie temperature up to 180 K and isostructural to the ‘122’ iron-based superconductors

Synthetic ferromagnetic nitrides: First-principles calculations of CaN and SrN

Ferromagnetic semiconductors: moving beyond (Ga,Mn)As

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