Spin reorientation process in Tm2–xHoxFe14B – analysis of conical arrangement based on Mössbauer spectra

Open access

Abstract

The spin reorientation process in the Tm2-xHoxFe14B series of compounds was studied using 57Fe Mössbauer spectroscopy over the temperature range 5.2-320 K with a focus on the analysis of conical spin arrangement. Each compound was studied by precise Mössbauer scanning in the vicinity of the transition and during the transition. By applying computer simulations based on the simplified Yamada-Kato model, as well as on some literature data for R2Fe14B (R = Tm, Ho) compounds, the above series was selected for studies as it contains compounds with different spin arrangements (axial, planar, conical). It was a crucial requirement for obtaining unambiguous angular dependences when applying a simultaneous fitting procedure of Mössbauer spectra. Such an extended procedure was applied which allowed the temperature dependence of the angle describing the position of the magnetization vector to be obtained. The results were compared with those from theoretical simulations. The spin arrangement diagram was constructed. A conical spin arrangement was confirmed over a wide temperature range.

If the inline PDF is not rendering correctly, you can download the PDF file here.

  • 1. Herbst I. F. (1991). R2Fe14B materials: Intrinsic properties and technological aspects. Rev. Mod. Phys. 63(4) 819.

  • 2. O’Handley R. C. (2000). Modern magnetic materials: Principles and applications. New York: Wiley.

  • 3. Lim J. T. Kim H. K. Kim C. S. An S. Y. & Choi K. R. (2015). Investigation of the magnetic properties of Dy doped Nd-Fe-B permanent magnet by using Mössbauer spectroscopy. J. Korean Phys. Soc. 66 1913-1917. DOI: 10.3938/jkps.66.1913.

  • 4. Pankratov N. Yu. Nikitin A. A. Iwasieczko W. Drulis H. Skokov K. P. Pastushenkov Yu. G. Harutjunjan N. Lyubina J. Gutfleisch O. Handstein A. & Müller K. -H. (2006). Spin-reorientation transition in Nd2(FeCo)14B compounds and their hydrides. J. Magn. Magn. Mater. 300 e465-e468. DOI: 10.1016/j.jmmm.2005.10.195.

  • 5. Hirosawa S. Yutaka M. Hitoshi Y. Setsuo F. Masato S. & Hiroshi Y. (1986). Magnetization and magnetic anisotropy of R2Fe14B measured on single crystals. J. Appl. Phys. 59 873. DOI: 10.1063/1.336611.

  • 6. Ibarra M. R. Pareti L. Algarabel P. A. Morellon L. Marquina C. & Solzi M. (1993). Magnetic anisotropy in (ErxHo1-x)2Fel4B pseudoternary intermetallic compounds. J. Phys.-Condens. Matter 5(31) 5637. DOI: 10.1088/0953-8984/5/31/025.

  • 7. Piqué C. Burriel R. & Bartolomé J. (1996). Spin reorientation phase transitions in R2Fel4B (R = Y Nd Ho Er Tm) investigated by heat capacity measurements. J. Magn. Magn. Mater. 154 71-82. DOI: 10.1016/0304-8853(95)00571-4.

  • 8. Wolfers P. Bacmann M. & Fruchart D. (2001). Single crystal neutron diffraction investigations of the crystal and magnetic structures of R2Fe14B (R=Y Nd Ho Er). J. Alloy. Compd. 317/318 39-43. DOI: 10.1016/S0925-8388(00)01353-0.

  • 9. Rillo C. Chaboy J. Navarro R. Bartolome J. Fruchart D. Chenevier B. Yaouanc A. Sagawa M. & Hirosawa S. (1988). Dynamical susceptibility of Ho2Fe14B single crystal: Spin rotation and domain wall motions. J. Appl. Phys. 64 5534-5536. DOI: 10.1063/1.342327.

  • 10. Kurzydło P. M. Pędziwiatr A. T. Bogacz B. F. Przewoźnik J. & Oleszak D. (2016). Conical spin arrangement and spin reorientation process in Er2-xHoxFe14B observed with Mössbauer spectroscopy. J. Alloy. Compd. 684 587-593. DOI: 10.1016/j.jalcom.2016.05.140.

  • 11. Yamada M. Kato H. Yamamoto H. & Nakagawa Y. (1988). Crystal-fi eld analysis of the magnetization process in a series of Nd2Fe14B-type compounds. Phys. Rev. B 38 620-633. DOI: 10.1103/PhysRevB.38.620.

  • 12. Burzo E. (1998). Permanent magnets based on R-Fe-B and R-Fe-C alloys. Rep. Prog. Phys. 60 1099-1266. DOI: 10.1088/0034-4885/61/9/001.

  • 13. Coey J. M. D. (1996). Rare-earth iron permanent magnet. Oxford: Clarendon Press.

  • 14. Bogacz B. F. & Pędziwiatr A. T. (2013). Crystal electric fi eld parameters determination for R2Fe14B compounds based on Yamada-Kato model. Nukleonika 58(1) 31-33.

  • 15. Susilo R. A. Munoz Perez S. Cobas R. Cadogan J. M. & Avdeev M. (2012). Magnetic order and spinreorientation in HoGa. J. Phys.-Conf. Series 340 012071. DOI: 10.1088/1742-6596/340/1/012071.

Search
Journal information
Impact Factor

IMPACT FACTOR 2018: 0.585
5-year IMPACT FACTOR: 0.513

CiteScore 2018: 0.60

SCImago Journal Rank (SJR) 2018: 0.250
Source Normalized Impact per Paper (SNIP) 2018: 0.527

Metrics
All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 202 130 9
PDF Downloads 106 87 9