Discovery of ferromagnetism with large magnetic anisotropy in ZrMnP and HfMnP

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2016-08-29
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Lamichhane, Tej
Taufour, Valentin
Masters, Morgan
Parker, David
Kaluarachchi, Udhara
Thimmai, Srinivasa
Bud’ko, Sergey
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Canfield, Paul
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Ames National Laboratory

Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.

For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.

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ZrMnP and HfMnP single crystals are grown by a self-flux growth technique, and structural as well as temperature dependent magnetic and transport properties are studied. Both compounds have an orthorhombic crystal structure. ZrMnP and HfMnP are ferromagnetic with Curie temperatures around 370 K and 320 K, respectively. The spontaneous magnetizations of ZrMnP and HfMnP are determined to be 1.9 μB/f.u. and 2.1 μB/f.u., respectively, at 50 K. The magnetocaloric effect of ZrMnP in terms of entropy change (ΔS) is estimated to be −6.7 kJ m−3 K−1 around 369 K. The easy axis of magnetization is [100] for both compounds, with a small anisotropy relative to the [010] axis. At 50 K, the anisotropy field along the [001] axis is ∼4.6 T for ZrMnP and ∼10 T for HfMnP. Such large magnetic anisotropy is remarkable considering the absence of rare-earth elements in these compounds. The first principle calculation correctly predicts the magnetization and hard axis orientation for both compounds, and predicts the experimental HfMnP anisotropy field within 25%. More importantly, our calculations suggest that the large magnetic anisotropy comes primarily from the Mn atoms, suggesting that similarly large anisotropies may be found in other 3d transition metal compounds.

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This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in: Lamichhane, Tej N., Valentin Taufour, Morgan W. Masters, David S. Parker, Udhara S. Kaluarachchi, Srinivasa Thimmaiah, Sergey L. Bud'ko, and Paul C. Canfield. "Discovery of ferromagnetism with large magnetic anisotropy in ZrMnP and HfMnP." Applied Physics Letters 109, no. 9 (2016): 092402, and may be found at DOI: 10.1063/1.4961933. Posted with permission.

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Fri Jan 01 00:00:00 UTC 2016
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