The eect of vanadium substitution on the structural and magnetic properties of Fe 1xVx3Ga4 Brandon Wilfong1Vaibhav Sharma2Omar Bishop2Adrian

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The eﬀect of vanadium substitution on the structural and magnetic properties of

(Fe1−xVx)3Ga4

Brandon Wilfong,1Vaibhav Sharma,2Omar Bishop,2Adrian

Fedorko,3Don Heiman,3, 4 Radhika Barua,2and Michelle E. Jamer1, ∗

1Physics Department, United States Naval Academy, Annapolis, MD 20899, USA

2Mechanical and Nuclear Engineering, Virginia Commonwealth University, Richmond, VA 23220, USA

3Physics Department, Northeastern University, Boston, MA 02115, USA

4Plasma Science and Fusion Center, MIT, Cambridge, MA, 02139, USA

(Dated: October 4, 2022)

Fe3Ga4displays a complex magnetic phase diagram that is sensitive and tunable with both elec-

tronic and crystallographic structure changes. In order to explore this tunability, vanadium-doped

(Fe1−xVx)3Ga4has been synthesized and characterized. High-resolution synchrotron X-ray diﬀrac-

tion and Rietveld reﬁnement show that samples up to 20% V-doping remain isostructural to Fe3Ga4

and display a linear increase in unit cell volume as doping is increased. Magnetic measurements re-

veal a suppression of the antiferromagnetic helical spin-density wave (SDW) with V-doping, revealed

by changes in both the low-temperature ferromagnetic-antiferromagentic (FM-AFM) transition (T1)

and high-temperature AFM-FM transition (T2). At 7.5% V-doping, the metamagnetic behavior of

the helical AFM SDW phase is no longer observed. These results oﬀer an avenue to eﬀective tuning

of the magnetic order in Fe3Ga4for devices, as well as increased understanding of the magnetism

in this system.

Materials with metallic antiferromagnetic behavior

at room temperature have been a focus of recent re-

search due to the unique interplay of electron spin and

charge.[1–3] These materials are especially important in

AFM spintronic devices if they are metallic.[4–6] A ma-

terial of interest is intermetallic Fe3Ga4, which displays a

complex magnetic phase evolution with respect to tem-

perature and magnetic ﬁeld.[7–10] The ground state of

Fe3Ga4is ferromagnetic (FM), which transitions to an

intermediate AFM phase at T1∼68 K that exists over

a wide temperature range, and transitions to a high-

temperature FM phase at T2∼360 K. The intermedi-

ate AFM phase exists at room-temperature, is metallic,

and has been explored more in-depth in recent work, de-

termining that the AFM order is a helical spin-density

wave (SDW).[7, 11–13] In addition to metallic behavior,

the helical AFM/SDW exhibits complex metamagnetic

evolution that is integral to its exotic properties such as

the topological Hall eﬀect.[8, 11]

For potential applications, the magnetic phase tran-

sition from an AFM state to an FM state near room

temperature (∼360 K) is of key interest, such as in

FeRh.[14–17] It is important to understand how to tune

the magnetic phase transition temperatures by external

parameters. Additionally, from a fundamental point-

of-view, probing external parameters’ eﬀect on these

magnetic transitions will be useful to understand how

and why the magnetic phases in this material manifest.

[18–20] Previous work has shown that external pressure

is an eﬀective means to tune the magnetic transition

temperatures;[7, 21–23] however, this has not been sys-

tematically linked to structural and/or electronic changes

∗jamer@usna.edu

induced by pressure. Previous work determined the eﬀect

of doping of other metals on the magnetic phase diagram

of Fe3Ga4through Fe site and Ga site substitution.[24–

28] From these studies, it is clear that the helical SDW

is sensitive to eﬀects caused by doping similar to elec-

tronic and crystallographic structural changes, and the

incorporation of vanadium is studied here.

In this work, V-doped (Fe1−xVx)3Ga4was prepared

with x = 0.025, 0.05, 0.075, 0.1, 0.15, 0.2, in order to

explore how both structural and electronic changes af-

fect the magnetic phases. Previous work has shown that

minute changes in crystal structure induced by anneal-

ing and pressure can change the magnetic transition tem-

peratures, but details of V-doping are absent.[7, 8] Due

to the electronic conﬁguration of V, the addition of V

as a dopant will lead to one of the largest possible ex-

pansions of the crystal lattice in the Fe3Ga4compound,

which could give insight on the eﬀect of negative pres-

sure in the lattice. We have performed high-resolution

synchrotron X-ray diﬀraction analysis in order to track

crystallographic changes concomitant with V-doping and

probe the eﬀect on magnetic properties. Additionally,

previous work has shown the importance of both the elec-

tronic conﬁguration and Fe-Fe magnetic interactions on

the magnetic phase diagram of Fe3Ga4,[7, 8, 11] and we

seek to probe how V-doping on the Fe sites aﬀects the

magnetic properties. This current work oﬀers another

avenue for tuning the magnetic phases for potential ap-

plications as well as to better understand the mechanism

for changes in magnetic order.

Polycrystalline samples of V-doped (Fe1−xVx)3Ga4

were synthesized via arc-melting the elements in stoichio-

metric ratios with concentrations up to x = 0.20, using

an Edmund Buehler MAM-1 under ultra-high purity Ar

atmosphere. Elemental Fe granules (Alfa Aesar 99.98%),

Ga solid (Alfa Aesar 99.99%) and V plates (Alfa Aesar,

arXiv:2210.01039v1 [cond-mat.mtrl-sci] 3 Oct 2022

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Theeectofvanadiumsubstitutiononthestructuralandmagneticpropertiesof(Fe1xVx)3Ga4BrandonWilfong,1VaibhavSharma,2OmarBishop,2AdrianFedorko,3DonHeiman,3,4RadhikaBarua,2andMichelleE.Jamer1,1PhysicsDepartment,UnitedStatesNavalAcademy,Annapolis,MD20899,USA2MechanicalandNuclearEngineering,VirginiaCommonwe...

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The eect of vanadium substitution on the structural and magnetic properties of Fe 1xVx3Ga4 Brandon Wilfong1Vaibhav Sharma2Omar Bishop2Adrian

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